Question

A body of mass 10 kg is falling from height of 10m . What will be the kinetic energy with which the body hits the ground ?​

Answer 1

Answer:

(a). Mass of the Body = 10 kg.

Height = 10 m.

Acceleration due to gravity = 9.8 m/s².

Using the Formula,Potential Energy = mgh

= 10 × 9.8 × 10 = 980 J.

• (b). Now, By the law of the conservation of the Energy, Total amount of the energy of the system remains constant.

∴ Kinetic Energy before the body reaches the ground is equal to the Potential Energy at the height of 10 m.

∴ Kinetic Energy = 980 J.

(c). Kinetic Energy = 980 J.

Mass of the ball = 10 kg.

∵ K.E. = 1/2 × mv²

∴ 980 = 1/2 × 10 × v²

∴ v² = 980/5

⇒ v² = 196

∴ v = 14 m/s

Answer 2

Answer:

Answer:

200 J

Explanation:

Given :

Mass of body = 10 kg

Height = 10m

Taking value of g = 10 m / sec²

Potential energy = m g h

Putting value here we get :

P.E. = 10 × 10 × 10 J

P.E. = 1000

Therefore , loss of potential energy is 1000 J.

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