Answer:
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
