What kinetic energy does a 10 g bullet have if its velocity is 800 m / s? What speed should a projectile weighing 2 kg

What kinetic energy does a 10 g bullet have if its velocity is 800 m / s? What speed should a projectile weighing 2 kg have to have the same energy?

Given: m1 = 10g = 0.01kg
v1 = 800 m / s
m2 = 2kg
E1 = E2
Find: E1-?
v2-?
E1 = (m1 * v1 ^ 2): 2
E1 = (0.01kg * 640000m ^ 2 / s ^ 2): 2
E1 = 3200J
E2 = (m2 * v2 ^ 2): 2
v2 = √ ((2 * E2): m2))
v2 = √ (6400J: 2kg) = 56.7 m / s
Answer: 3200J, 56.7m / s