A ball of mass 0.5 kg slows down from a speed of 5ms^-1to 3ms^-1.Calculate the change in kinetic energy of the ball.

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Solution

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

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