1.
A car starts from rest accelerated for 5 minutes to achieve 25 \(m/s\) velocity. Find its accleration.
Exercises 2.4 Exercise
2.
A ball thrown upward at 30 m/s will continue to rise for about how long?
3.
Find the maximum height attained by the ball if it is thrown vertically up with 30 m/s velocity.
4.
A car starts from rest with a constant acceleration of 4 \(m/s^2\text{.}\) How much time does the car take to cover the first 160 m?
5.
A break is applied in car moving at 10 \(m/s\) undergoes an acceleration of \(-1.2 m/s^2\text{.}\)
- How far does the car travel in the next 5 s?
- How far does the car travel before it comes to stop?
6.
When a 20 N force is applied on an object it starts accelerating by \(5 m/s^2\text{.}\)
What net force would give the same object an acceleration of \(1 m/s^2\text{?}\)
7.
A 3000 kg truck accelerates from 5 m/s to 25 m/s in 8 s. How much is the net force acting on the truck?
8.
A force of 2 N acts on a 2 kg object, initially at rest, for 2 s. How far does the object move during that time?
9.
How much braking force is needed to bring a 4000 kg truck to a stop from a speed of 20 m/s in 5 s?
10.
A 300 g ball is struck with a bat with a force of 150 N. If the bat was in contact with the ball for 0.02 s, find the velocity at which the ball flew off?
11.
From the roof of house one stone is thrown upward and another identical stone is dropped down. What will happen to both the stones when they reach the ground?
- They will have the same velocity.
- They will have the same acceleration.
- They reach the ground at the same time.
- None of the choices are correct.
Solution.
Answer: b. They will have the same acceleration when reach the ground.
12.
What will happen to the two balls, when first ball A is thrown horizontally and second ball B is thrown upward?
- Ball A will have the greater downward acceleration.
- Ball B will have the greater downward acceleration.
- Neither will have any downward acceleration.
- They will have the same downward acceleration.
13.
What is the mass of an elephant who weighs 10000 N?
14.
An object moving in a circle at constant speed is accelerated
- toward the center of the circle.
- in the direction of its motion.
- away from the center of the circle.
- Any of these choices, depending on the circumstances.
15.
Find the centripetal force on the ball of mass 200 g moving in a circle 20 cm in radius at a speed of 4 m/s.
16.
Find the weight of a person whose mass is 80 kg on the earth is now on a spacecraft at a height of 2 earth radii above the earth’s surface.
17.
What is acceleration?
- The rate of change of an object’s velocity over time.
- The distance an object travels in a given time.
- The force that causes an object to move.
- The direction an object is moving in.
18.
What is terminal velocity?
- The maximum speed an object can reach in free fall.
- The speed at which an object is moving at a given moment.
- The speed of an object when it hits the ground.
- The speed at which an object moves through a fluid when the resistance force of the fluid equals the weight of the object.
19.
What is the formula for calculating the distance an object falls due to gravity?
- \(\displaystyle d = vt\)
- \(\displaystyle d = 1/2at^2\)
- \(\displaystyle d = (v_i + v_f)/2 * t\)
- \(\displaystyle d = mgh\)
20.
What is projectile motion?
- Motion that occurs in a straight line
- Motion that occurs in a circular path
- Motion that occurs in a parabolic path
- Motion that occurs horizontally
21.
What are the two components of projectile motion?
- Acceleration and velocity
- Distance and time
- Vertical motion and horizontal motion
- Weight and mass
22.
An object is moving with an initial velocity of 10 m/s and accelerates uniformly at a rate of \(5 m/s^2\) for 6 seconds. What is the final velocity of the object?
23.
A car starts from rest and accelerates at a rate of \(4 m/s^2\) for 5 seconds. What is the final velocity of the car?
24.
A car is traveling at a constant speed of 20 m/s when the driver applies the brakes, causing the car to decelerate at a rate of \(5 m/s^2\text{.}\) How long will it take for the car to come to a complete stop?
