Question

stone dropped from the top of a building has a velocity of 29.4m/s on reaching ground level. Calculate the time for which stone was falling freely. (Take g = 9.8m/s2​

Answer 1

Answer:

3 s

Explanation:

since, the stone was dropped its initial velocity is zero.

(dropping a Stone is just like one second you held it while the other it was in the air falling freely under gravity)

• initial velocity (u) = 0 m/ s

• final velocity (v) = 29. 4 m/ s

• acceleration due to gravity (a) = 9. 8 m/ s²

For uniformly accelerated motion we have

v = u + at

placing values of v, u and a

29. 4 = 0 + 9. 8 × t

t = 29. 4/ 9. 8

t= 3 s

So, the time for which the stone was falling freely is 3 seconds

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Hope this helps!