Question

A car has a kinetic energy of 41.6 kJ.

The speed of the car is 8.0m/s.
Calculate the mass of the car.

Answer 1

K=1/2 mv2

M=?

41.6kj convert to joules by multiplying by 1000 so it will be 41,600J because the unit of kinetic energy is in joules.

41,600=1/2(m)(8)

Arrange the equation it will be:

M= 41,600/4 = 10,400

Final answer is:
m= 10,400 kg