Question

The kinetic energy of an object of mass m moving with a velocity of 5m/s is 25j. what will be its kinetic energy if the velocity is doubled? What will be its kinetic energy when its velocity is increased three times?

Answer 1

Answer:

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

Answer 2

Explanation:

HEY MATE ..

Given, velocity of object,v=5ms −1

;kinetic energy of an object,E k=25J

E k = 1 / 2 mv ^2or 25

= 1/ 2 ×m×(5) ^2or

m= 25 / 50 =2kg.

When the velocity triples,E K = 1 / 2 mv ^2

= 21×2×(15) ^2

=225J

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