A15 kg bullet leaves the 30 cm long barrel of a gun at a speed of 240 m/s.
a. find the exit velocity of the bullet.
b. find the average force exerted on the bullet by the expanding gases as the bullet moves through the length of the 30 cm barrel

Aboy with a mass 25 kg climbs into a small tree. he sits on a branch that is 2.o m above to the ground.what is his gravitational potential energy above the ground?

A0.750 kg aluminum pan is removed from the stove and plunged into a sink filled with 10.0 kg of water at 293 k. the water temperature quickly rises to 297 k. what was the initial temperature of the aluminum pan? the specific heat of aluminum is ca = 900 j/(kgk) and water is cw = 4190 j/(kgk)

If anyone who can me with this hw? i would really appreciate it