A ball is dropped from a height of 10 m. | Class 9 Science Chapter Work and Energy, Work and Energy NCERT Solutions

Question:

A ball is dropped from a height of 10 m. If the energy of the ball reduces by 40% after striking the ground, how much high can the ball bounce back? (g = 10 m s–2)

Answer:

Let the initial energy of the body of mass (m) at height (h) is mgh. If the energy of the ball reduces by 40 % after striking the ground, the remaining energy of the ball will be 60 % of initial energy.

According to the question,
mgh’ = 60% of mgh => h’ = (60/100) 10 = 6 m.


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Welcome to the NCERT Solutions for Class 9 Science - Chapter . This page offers a step-by-step solution to the specific question from Excercise 0 , Question 19: A ball is dropped from a height of 10 m. If the energy of the ball reduces by 40% after striking the....