Answer: 40m/s
Explanation:
Given that,
speed of car (v) = ?
Mass of car (m) = 500.0 kilogram
Kinetic energy (KE) = 400,000 joules
Recall that kinetic energy is possessed by a moving object, and it depends on the mass and speed by which the object moves
i.e Kinetic energy = 1/2mv²
400,000J = 1/2 x 500.0kg x v²
400,000J = 250.0kg x v²
v² = 400,000J / 250.0kg
v² = 1600
Find the square root of v²
v = √1600
v = 40m/s
Thus, the speed of the car is 40m/s
