A ball is dropped from a height of 10m. If the energy of the ball reduces by 40% after striking the ground. How much height can the ball bounce back ?
Answers
Answered by
11
If the energy of a ball falling from a height of 10 meters is reduced by 40%, how high would it rebound?
Still have a question? Ask your own!
What is your question?
7 ANSWERS

Mudasir Hanif Shaikh
Answered Jul 21, 2017
Let E be the energy of the ball falling through a height of 10m
E = mgh (potential energy)
E = m(9.8)(10)
E = 98m J ; (where m = mass of body.)
now let’s suppose the body losses 40% of its energy and rebounds back to a height of “h1’and its new energy is “E1” which is 60% of the initial energy “E”
E1 = 60% (E)
also
E1 = mgh1 (the mass remains the same)
=> m(9.8)h1 = 60/100 ( 98m)
the m’s cancel out.
Therefore,
9.8 (h1) = 0.6 (98)
h1 = 0.6 (10)
h1 = 6m.
Still have a question? Ask your own!
What is your question?
7 ANSWERS

Mudasir Hanif Shaikh
Answered Jul 21, 2017
Let E be the energy of the ball falling through a height of 10m
E = mgh (potential energy)
E = m(9.8)(10)
E = 98m J ; (where m = mass of body.)
now let’s suppose the body losses 40% of its energy and rebounds back to a height of “h1’and its new energy is “E1” which is 60% of the initial energy “E”
E1 = 60% (E)
also
E1 = mgh1 (the mass remains the same)
=> m(9.8)h1 = 60/100 ( 98m)
the m’s cancel out.
Therefore,
9.8 (h1) = 0.6 (98)
h1 = 0.6 (10)
h1 = 6m.
Similar questions