A car of mass 1380 kg, travelling at 31.1 m s^-1, is brought to rest by the brakes in 48.2 m. Calculate (i) the initial kinetic energy of the car
(ii) average deceleration of a car
(iii) the average braking force

Find the momentum for a 2.6-kg brick parachuting straight downward at a constant speed of 8.4 m/s .

A175 g lump of molten lead at its melting point (327 c) is placed into 55.0 g of water at 20.0 c. the specific heat of lead is 130.j/kg c and the hf of lead is 20,400 j/kg. when the lead and the water have reached equilibrium, what is the temperature of the mixture?

Aspring has a natural length of 8 m. if a 12-n force is required to keep it stretched to a length of 10 m, how much work w is required to stretch it from 8 m to 16 m? (round your answer to two decimal places.)