Question

K.E of abody of mass 2kg is 8j.K.E of a body of mass 4kg moving with the same velocity as the frst body will be ??​

Answer 1

Given :

• Mass first body (M1) = 2 kg
• Kinetic energy of first body (K.E1) = 8 J
• Mass of Second body (M2) = 4 kg

To FinD :

• Kinetic Energy of 2nd body

SolutioN :

We are given that both the bodies are moving with same velocities,

For 1st Body :

⇒K.E1 = ½M1V²

⇒8 = ½ * 2 * V²

⇒8 = V²

⇒V² = 8

⇒V = √8

⇒V = 2√2

∴ Velocity of bodies is 2√2 m/s.

________________________

Now, Kinetic Energy of 2nd Body :

⇒K.E2 = ½M2V²

⇒K.E2 = ½ * 4 * (2√2)²

⇒K.E2 = 2 * 8

⇒K.E2 = 16

∴ Kinetic Energy of 2nd body is 16 J.

Answer 2

Answer :

Refer to the attachment