Question

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 velocity is increased three times​

Answer 1

Given:-

• Kinetic Energy ,KE = 25 J

• Velocity ,V = 5m/s

To Find:-

• Kinetic energy when its velocity is increased three times.

Solution:-

Firstly we calculate the mass of the body . As we know that Kinetic Energy is the energy possess by body due to its motion.

• KE = 1/2mv²

Where

KE is the Kinetic Energy

m is the mass of the body

v is the final velocity

Substitute the value we get

→ 25 = 1/2×m× 5²

→ 25×2 = m × 25

→ 50 = m × 25

→ m = 50/25

→ m = 2 kg

Mass of the object is 2kg .

If the velocity of the object increase by three times .Then the new velocity is 3 × 5 = 15m/s

Now calculating the New kinetic Energy

• KE ' = 1/2mv²

Substitute the value we get

→ KE' = 1/2× 2 × 15²

→ KE' = 15×15

→ KE' = 225 J

Therefore, the new kinetic energy of the object is 225 Joules.

Answer 2

Answer:

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