Question

Kinetic energy of a ball of mass 50 g is 10 J. Find the speed of the ball ​

Answer 1

Answer:

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Explanation:

1/2 mv² = 10 J

1 × 50 × V² / 2 × 1000 = 10 J

V² = 10 × 2 × 100 / 5

V² = 400

V = 20 m/s

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Answer 2

Answer:

The speed of the ball will be 20 m/s.

Explanation:

If 'm' is the mass of an object in Kg moving with a velocity of 'v' m/s, then its kinetic energy is given by the equation,

K.E = (mv²) / 2

We have,

Mass of the ball, m = 50 g = 0.05 Kg

The kinetic energy of the ball, K.E = 10 J

 K.E = (mv²) / 2

⇒ v² = (2 × K.E) / m

        = (2 × 10) / 0.05

        = 20 / 0.05

        = 400

  ∴ v = √400

     v = 20 m/s