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CBSE Class 9 Answered

a stone is released from the top of a tower of height 78.4m . find the time taken by the stone to reach the ground (g= 9.8 meter per acceleration square
Asked by sawantananya388 | 20 May, 2024, 10:40: PM
answered-by-expert Expert Answer

Time taken t by the stone to reach ground is calculated from the equation of motion

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where h is height of tower , u is initial velocity of stione that is zero because stone is released from rest 

and g is acceleration due to gravity .

If height of tower is 78.4 m , then

78.4 = (1/2) × 9.8 × t2

t2 = 78.4/4.9 = 16

t = 4 s

Answered by Thiyagarajan K | 21 May, 2024, 09:35: AM
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