Question

A stone falls from a tower of height 40 m. What will be its velocity, when it reaches on the land ? (A) 14 m/s (B) 28 m/s (C) 21 m/s (D) 7 m/s

Answer 1

Answer:

apply the LOCM

Step-by-step explanation:

according to the law of conservation of momentum:-

Ui + ki= Uf + Kf

mgh + 0 = 0+ 1/2 mv^2 (m=m; so cancelled).

400 = 1/2 v^2

so, v= 20√2

v= 28m/s ( ans)

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