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A ball is dropped gently from a height of 20m . If its velocity increases uniformly at the rate of 10m/s² . With what velocity will it strike to the ground.

Posted by Aparna Singh 4 years, 4 months ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years, 4 months ago

Let us assume, the final velocity with which ball will strike the ground be ‘v’ and time it takes to strike the ground be ‘t’
Initial Velocity of ball, u =0
Distance or height of fall, s =20 m
Downward acceleration, a =10 m s^-2
As we know, 2as =v2-u2
v² = 2as+ u²
= 2 x 10 x 20 + 0
= 400
= Final velocity of ball, v = 20 ms^-1
t = (v-u)/a
´Time taken by the ball to strike = (20-0)/10
= 20/10
= 2 seconds

0Thank You

ANSWER

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