Question

a ball of mass 0.5 kg slows down from a speed of 5m/s to 3m/s .calculate the change in kinetic energy of the ball.please state answer giving proper units?

Answer 1

M=0.5kg v(initial)=5m/s V(final)=3m/s
change in K.E=1/2×M×V×V-1/2×M×v×v
=1/2×0.5×9-1/2×0.5×25
=2.25-6.25
=-4kgm/ss

Answer 2

Answer:

-4kgm/s^2

Explanation:

M=0.5kg v(initial)=5m/s V(final)=3m/s

change in K.E=1/2×M×V×V-1/2×M×v×v

=1/2×0.5×9-1/2×0.5×25

=2.25-6.25

=-4kgm/s^2

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