a ball of mass 10 kg fall from tower 200 m hits ground come at rest after penetrating 100 cm find time
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Answer:
Explanation:
To find time
We need to know the velocity with which ball hits the ground and the retardation of the ball while penetrating
Hence
From formula of motion
v²-u²=2as
v²=2as+u²
v²=2*10m/s²*200m+0
v=63m/s(approx)
This is the velocity with which the ball hits the ground
Retardation of ball=v²-u²/2s
=0-4000m²/s²/400m
=-10m/s²
Time taken for penetrating can be found by
v=u+at
0=63m/s- 10m/s²*t
t=6.3s(approx)
Hope it helps
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