Question 1:
A ball is projected upward. Eventually, after the ball reaches its maximum height, it will fall back.Indicate which statement is correct.
- speed never changes
- At the highest point in its motion, the ball's velocity is zero.
- At the highest point in its motion, the ball's velocity is not zero
- none of the above
Question 2:
Assume a student throws a ball vertically downward with a velocity of 10 m/sIf air friction is considered negligable then calculate the speed of the ball one second later.
- 9.8 m/s
- 20 m/s
- 19.8 m/s
- 18.8 m/s
Question 3:
Suppose you throw a ball vertically with a velocity of 10 m/sApproximately, when will it reach its highest height?
- 3 s.
- 2 s.
- 5 s.
- 1 s.
Question 4:
Assume a television screen fall down from rest at a great height.Calculate the speed after it has fallen for 5 seconds where air resistance is considered negligible.
- 49 m/s
- 48 m/s
- 47m/s
- 46m/s
Question 5:
Assume a box of 5 kg is dropped from a building and hits the ground in 7 s.Calculate the time it takes for a 10-kg box to hit the ground where air resistance is considered negligible.
- 14 s
- 10 s
- 5 s
- 7 s
Question 6:
If a rocket is fired from a fighter jet and assuming that air resistance is negligible.Which statement is correct about the rocket.
- The rocket stops immediately.
- Its speed doubles every second.
- Its speed increases at 9.8 m/s.
- none of the above.
Question 7:
If you throw a ball up in the air.Indicate the status of the ball when it reaches its highest point.
- acceleration is zero.
- speed doubles every second.
- velocity is halved and the acceleration is downward.
- velocity is zero and the acceleration is downward.
- none of the above.
Question 8:
If you throw a ball up in the air with an initial velocity of 20m/s.Calculate the ball's velocity after 4 seconds.
- − 19.2 m/s
- 0 m/s
- 19.2 m/s
- 20 m/s