Question

What’s the velocity of a ball falling with 100 joules of kinetic energy and a mass of 2 kilograms? Use the formula, . 3 m/s 5 m/s 7 m/s 8 m/s 10 m/s

Answer 1

Kinetic energy of freely falling ball = $\frac{mv^{2} }{2}$
∴ velocity of ball = √(2×K.E/m) = √(200/2) = 10 m/s.

Answer 2

the answer on plato is 10m/s