Question : A boy standing at the top of a tower of 20 𝑚 height drops a stone. Assuming 𝑔 = 10 𝑚𝑠 −2, the velocity with which it hits the ground is
(A) 5.0 𝑚/𝑠
(B) 10.0 𝑚/𝑠
(C) 20.0 𝑚/𝑠
(D) 40.0 𝑚/s
Answer : option (C)
Solution :
A boy standing at the top of a tower of 20 𝑚 height drops a stone. Assuming 𝑔 = 10 𝑚𝑠 −2, the velocity with which it hits the ground is
with
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