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Ncert exemplar solutions
Grade 9 
Science
Science Exemplar Problems - class 9
Work and Energy
Work and Energy - Exercise
Question 19
Science
Science Exemplar Problems - class 9
Work and Energy
Work and Energy - Exercise
Question 19
Work and Energy | Work and Energy - Exercise
Question 19
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).
mgh=m×10×10= 100m joules
when 40% energy is reduced remaining energy will be 60mjoules
Hence 60 – m x 10 × h
H = -6m
Question 19
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).
mgh=m×10×10= 100m joules
when 40% energy is reduced remaining energy will be 60mjoules
Hence 60 – m x 10 × h
H = -6m
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