Motion in a Straight Line - Result Question 37

38. A boy standing at the top of a tower of 20m height drops a stone. Assuming g=10ms2, the velocity with which it hits the ground is

(a) 10.0m/s

(b) 20.0m/s

(c) 40.0m/s

(d) 5.0m/s

[2011]

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Answer:

Correct Answer: 38. (b)

Solution:

  1. (b) Here, u=0

We have, v2=u2+2gh

v=2gh=2×10×20=20m/s



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