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A ball is gently dropped from …

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A ball is gently dropped from a height of 20 m. If its velocity increases uniformly at the rate of 10 m s-2, with what velocity will it strike the ground? After what time will it strike the ground

Posted by Hyperkillér. Gaming 4 years ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 4 years 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’.

Given parameters

Initial Velocity of the 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

v²= (2 x 10 x 20 ) + 0

v²= 400

Final velocity of ball (v) = 20 ms^-1

t = (v – u)/a

Time taken by the ball to strike (t) = (20 – 0)/10

t = 20/10

t = 2 seconds

The final velocity with which ball will strike the ground is (v) = 20 ms^-1

The time it takes to strike the ground (t) = 2 seconds

1Thank You

ANSWER

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