If a rocket initially at rest accelerates at a rate of 60m/s^2 for one minute, i

Question

If a rocket initially at rest accelerates at a rate of 60m/s^2 for one minute, its speed will be 50m/s 3000m/s 3600m/s 500m/s An apple falls from a tree and hits the ground 20 meters below with a speed of about 5m/s 15m/s 10m/s 20m/s not enough information When a ball shown straight upwards reaches the very top of its path, its acceleration is 5m/s^2 zero 10m/s^2 None of the above At one an object in free fall is moving downward at 5m/s one second later its speed is 100m/s 50m/s 55m/s 25m/s 15m/s At one instant a heavy object in air is moving upward at 60m/s one second later its speed is approximately 55m/s 60m/s 50m/s 40m/s The distance a freely falling object falls from rest in one second is 5m 6m 4m none of the above An object falls freely from rest on a plant where the acceleration due to gravity is 2m/s^2 100m/s 70m/s 50m/s 20m/s 10m/s If you throw a ball straight downward(in the absence of air resistance), after leaving your hand its acceleration is greater than 10m/s^2 0m/s^2 less then 10m/s^2 10m/s^2

Explanation / Answer

(8).Its moves with constant velocity .So, change in velocity = 0

Therefore accleration a = change in velocity / time interval

= 0 / 10 = 0 m/s 2

(9)

change in velocity in 1 s is = 100 m/s - 90 m/s = 10m/s

Therefore accleration a = change in velocity / time interval

= 10 / 1 = 10 m/s 2

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