A constant 10 N horizontal force is applied to a 20 kg cart at rest on a level floor. If friction is negligible, what is the speed of the cart by the time it has been pushed 8.0 m?
A 2.50-kg fireworks shell is fired straight up from a mortar and reaches a height of 110 m above the muzzle of the mortar.
Neglecting air resistance, calculate the shell’s velocity when it leaves the mortar.
The mortar itself is a tube 0.450 m long. Calculate the magnitude of the average acceleration of the shell in the tube as it goes from zero to the velocity at which it leaves the mortar.
What is the magnitude of the average force on the shell in the mortar?
A helicopter has a mass of kg. The helicopter’s displacement varies with time according to . Find the net force on the helicopter at s.