Chapter 9

NCERT
Class 9
Science
Solutions
14. A stone is released from the top of a tower of height 19.6 m calculate it's final velocity just before touching the ground.

Question:

A stone is released from the top of a tower of height 19.6m. Calculate its final velocity just before touching the ground.

Answer:

According to question, u = 0, h = 19.6 m, g = 9.8 m/s2

from the equation,      v2 - u2 =2gh

 v2 - 0 =2x9.8x19.6

 v2 =19.6 ms-1

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