A 0.10-kilogram ball dropped vertically from a

height of 100 meter above the floor bounces back

to a height of 0.80 meter. The mechanical energy

lost by the ball as it bounces is

A. 0.080J

B.

0.20 J

C. 0.303

D. 0.78)

B

Explanation:

P. E = mass * acceleration due to gravity * height

initial P. E = 0.10 * 9.81 * 10 (in question 100 m is a typing error, it must be 1.00 m)

= 0.981J

final P. E = 0.10 * 9. 81 * 0.80

= 0.7848 J

HENCE mechanical energy lost = 0. 981 - 0.7848

= 0.1962 J

= 0.20 J

HENCE B