A body is falling freely from rest from a height of 100m. The ratio of kinetic energy after 2 and 5 seconds is _____

Category: QuestionsA body is falling freely from rest from a height of 100m. The ratio of kinetic energy after 2 and 5 seconds is _____
Editor">Editor Staff asked 1 year ago

A body is falling freely from rest from a height of 100m. The ratio of kinetic energy after 2 and 5 seconds is _____

(a) 2:5

(b) 4:25

(c) 25:4

(d) 5:2

This question was posed to me in quiz.

This question is from Kinetic Energy topic in section Work, Energy and Power of Physics – Class 11
Select the correct answer from above options
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Editor">Editor Staff answered 1 year ago

The correct option is (b) 4:25

Easiest explanation: From newtons law;

v1 = u + gt1

v1 = 2g

v2 = u + gt2

v2 = 5g

KE1 : KE2 = v1^2 : v2^2

= 4 : 25.

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