At what speed a person having 60 kg mass should run to acquire 750 j kinetic energy?

Mass = 60 kg

K.E = 750 J

v = ?

K.E = (1/2)mv^2

750 = (1/2) × 60 × v^2

v^2 = 150/6

v = √25

v = 5 m/s

    the man should run with a velocity of 5m/s

Correct  a₂ > a₁

Explanation:

Given:

Tony  mass = m₁ = 50 kg

Sam mass = m₂ = 45 kg

According to Newton's second law, the formula for calculating force is:

F = m · a

In this case we have the same force for both

F = m₁ a₁ = m₂ a₂  => a₁ / a₂ = m₂ / m₁ = 45 / 50 = 9 / 10 = 0.9

a₁ = 0.9 a₂  => a₁ = 90% of a₂ => a₂ > a₁

a₂ > a₁

God is with you!!!