Question

A body of mass 50 kg has a momentum of 1000 kg m/s. Calculate its K.E.

Answer 1

given,

mass (m) = 50kg

momentum (p) = 1000kg m/s

we know that,

momentum = mass * velocity

p = mv

1000 = 50*v

velocity(v) = 20m/s

we know that,

KE = 1/2(mv²)

= 1/2(50*20)

KE = 500 kgm²/s²

Answer 2

Answer:

10000 kg m/s

Explanation:

m = 50 kg

momentum (p) = mv

              1000 = 50 * v

                 v     = 1000/50 = 20 m/s

we know that,

K.E = 1/2 mv²

     = 1/2 * 50 * (20)²

     = 1/2 * 50 * 400

     = 10000 J ⇒ 10⁴ J