Question

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The kinetic energy of an object of mass m, moving with a velocity of 5 m/s is 25 J. What will be its kinetic energy when its speed is doubled? it is given here doubled not tripled​
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Answer 1

Answer:

Hence, kinetic energy = 25 × 4 = 100 J. (ii) If velocity is increased three times, then its kinetic energy becomes 9 times the original value, because it is proportional to the square of the velocity. Hence, kinetic energy = 25 × 9 = 225 J.

Answer 2

Answer:

Kinetic Energy is 100J when it is doubled

kinetic energy is 225J when it is increased three times

Explantion

V = 5m/s

KE = 25J

KE = 1/2MV^2

25 = 1/2 × M × 5 × 5

2 = m

When velocity is doubled

V = 5×2 = 10 m/s

KE = 1/2 × 2 × 10 × 10

KE = 100 J

When velocity is increased three times

V = 5×3 = 15m/s

KE = 1/2 × 2 × 15 × 15.

KE = 225 J