Question

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)

Answer 1

Answer:

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