Question

A ball is dropped from a height of 20 m .What is its velocity when it strike the ground?

Answer 1

Explanation:

ANSWER

Given, initial velocity of ball, u=0

Final velocity of ball, v=?

Distance through which the balls falls, s=20m

Acceleration a=10ms

−2

Time of fall, t=?

We know

v

2

−u

2

=2as

or v

2

−0=2×10×20=400 or v=20ms

−1

Now using v=u+at we have

20=0+10×t or t=2s

Answer 2

this is your answer hope it helps

2 s .............

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