Mechanical Energy: Kinetic Energy (KE)

Question

A bird flies at a speed of 2.7m/s if it has 26J of kinetic energy, what is its mass?

Answer 1

Kinetic Energy is equal to [Mass Times The Square Of Velocity] divided by 2.

Within KE = 0.5mv², place values to write 26 Joules = 0.5[Mass_bird × (2.7 Meters/Second)²].

Crush this last into 52 Joules ÷ 7.29 m²/s² = Mass_bird.

With the Joule equal to one kilogram-dot-meter-squared per second squared

{or kg•m²/s²}, 52 Joules ÷ 7.29 m²/s² will give the mass sought as 7.133058985

kilograms equivalent to 7.133 kg.