Alorry of mass 4000 kg is travelling at a speed of 4.0m/s.
a car has a mass of 1000kg. the kinetic energy of the car is equal to the kinetic energy of the lorry.
what is the speed of the car?

a) 2.0m/s b) 4.0m/s c) 8.0m/s d)16.0m/s
pls anwser

8 ms⁻¹

Explanation:

Kinetic energy is the energy possessed by a moving object solely due to its motion.

You can get the K.E. of an object using the equation,

K.E. =  (1/2)mv²

So you get, for lorry,

K.E. = (1/2)4000×4² (1)

for car,

K.E. = (1/2)1000×v²(2)

(1)=(2)

(1/2)4000×4² =  (1/2)1000×v²

y these two equations, we get, v = 8 ms⁻¹