Question

3. The kinetic energy of an object of mass ‘m’ moving with a velocity of 5 ms-1 is 25 J. What will be its kinetic energy when its velocity is doubled? What will be its kinetic energy when its velocity is increased three times.​

Answer 1

Explanation:

Given, velocityofobject,v=5ms−1;

kineticenergyofanobject,EK=25J

EK=21mv2 or 25=21×m×(5)2

or m=2550=2kg

When the velocity triples,

EK=21mv2=21×2×(15)2=225J