Question

If a stone is thrown vertically upwards to a height of 9.8m, calculate (i) the velocity with which it was thrown and (ii) time taken by it to reach the highest point. Take g 10m/s2

Answer 1

Hi friend
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Your answer
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Height to which a stone was thrown = 9.8 m

To calculate : -
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(i) Velocity (Initial)
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v = 0 m/s , s = 9.8 m , a = g = - 10 m/s² [stone us thrown upwards, so against gravity, acceleration will be negative]

v² - u² = 2 × g × s

=> (0)² - u² = 2 × 10 × ( -9.8 )

=> - u² = - 196

=> u² = 196

=> u = √196

=> u = 14 m/s

(ii) Time taken to reach the highest point
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v = u + at

=> 14 = 0 + 10 × t

=> 14 = 10t

=> t = 14/10

=> t = 1.4 seconds

HOPE IT HELPS

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Answer 2

The above picture have complete solution to your question.