Question

A car is moving with a uniform velocity of 54km/hr.what is the Kenitic energy of a body of a boy of mass 40kg sitting in his car

Answer 1

54 km/h=15 m/s

mass=40kg

so K.E. of boy is ½ mv²

K.E.=½(40)(15)²

=4500 J

Answer 2

Answer:

4500 J

Explanation:

Given,

m = 40 kg

v = 54 km/hr = 54 x 1000/3600

                     = 15 m/s

K.E = 1/2 mv^2

      = 1/2 x 40 x (15)^2

      = 20 x 225

      = 4500 J

Hope it helps u, frnd!