Question

A 2.0 g bullet leaves the barrel of a gun at a speed of270 m/s. (a) Find its kinetic energy. = J (b) Find the average force exerted by the expanding gases on thebullet as it moves the length of the 50 cm long barrel. = N

Other
A 2.0 g bullet leaves the barrel of a gun at a speed of270 m/s.
(a) Find its kinetic energy.
= J
(b) Find the average force exerted by the expanding gases on thebullet as it moves the length of the 50 cm long barrel.
= N

$$K = (\frac{1}{2}) m v^{2}= (\frac{1}{2}) (0.002 kg) (270m/s)^{2} =$$ $$72.9\ Joules$$
Work = K = force *distance so: $$force = K / dist = 72.9\ Joules / 0.50\ meter = 145.8\ Newtons$$