Question

A ball of mass 0.5 kg slow down from the speed of 5 metre per second to 3 metre per second calculate the change in kinetic energy state your answer with giving proper unit . ​

Answer 1

Answer:

Initial Kinetic Energy KE

i

=0.5×m×v

1

2

Final Kinetic Energy K.E

f

=0.5×m×v

2

2

KE

difference

=KE

f

−KE

i

KE

difference

=

2

1

×0.5(3×3−5×5)

KE

difference

=

4

1

(9−25)

KE

difference

=

4

−16

=−4J

Hence kinetic energy will get reduced by 4J

Explanation:

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Answer 2

Answer:

Mass of ball:-0.5kg

initial velocity:-5m/s

initial kinetic energy:-1/2×mass×velocity^2

=1/2×0.5×5^2

=1/2×0.5×6.25J=6.25J

final velocity of ball=3m/s

final kinetic energy of ball=1/2×mass×velocity^2

=1/2×0.5×3^2

=1/2×0.5×9=2.25J

=6.25-2.25=-4J

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