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CBSE Class 9 Answered

A ball thrown up vertically returns to the earth after 12 seconds. Find the velocity with which it was thrown up.
Asked by saanidhyapatil | 16 Feb, 2022, 01:23: PM
If the ball returns in 12 s , then time to reach maximum height from ground will be 6 s .

Let us use the equation of motion " v = u - ( g t ) " , where v =0 is final velocity because at maximum height velocity is zero ,
u is initial velocity , g is acceleration due to gravity and t is time taken to reach maximum height.

hence , we get , u = ( g t ) = 9.8 × 6 = 58.8 m/s

The ball is thrown from ground vertically upwards with initial velocity u = 58.8 m/s
Answered by Thiyagarajan K | 16 Feb, 2022, 02:42: PM

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