Question - 2 :
A ball falls freely on a perfectly elastic plate from a height of 3.0 m. At the instant t = 0 , the velocity of the ball is zero. Draw time - velocity graph for the motion of the ball. Label the axes and show the mathematical calculations required. ( g = 9.8 m/s^2 ).
Asked by sudhanshubhushanroy
25th February 2018,
4:17 PM
Answered by Expert
Answer:
When the ball is dropped from a height of 3 m, the time to reach the ground is 7.6 s and the velocity it will get is 74.5 m/s. Calculations are given below
time to reach ground = square root of( 2×g×h) = square root of(2×9.8×3) = 7.6 s
velocity when the ball hitting the ground = g×t = 9.8×7.6 = 74.5 m/s
since the floor is elastic, the ball rebounds with the same velocity 74.5 m./s
Answered by Expert
26th February 2018,
8:38 AM
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