A 0.950 kg hammer is moving horizontally at 7.50 m/s when it strikes a nail and comes to rest after driving it 1.00 cm into a board. (a) Calculate the duration of the impact in seconds. (Enter a number.) (b) What was the average force in newtons exerted downward on the nail? (Enter a number.)

0.400 kg hammer is moving horizontally at 7.50 m/s when it strikes a nail and comes to rest after driving it 1.00 cm into a board. (a) Calculate the duration of the impact in seconds. (Enter a number.) s (b) What was the average force in newtons exerted downward on the nail? (Enter a number.)

A girl launches a toy rocket from the ground. The engine experiences an average thrust of 5.26 N. The mass of the engine plus fuel before liftoff is 24.9 g, which includes fuel mass of 12.7 g. The engine fires for a total of 1.90 s. (Assume all the fuel is consumed.) (a) Calculate the average exhaust speed of the engine (in m/s). m/s (b) This engine is positioned in a rocket shell mass 42.5 g. What is the magnitude of the final velocity of the rocket (in m/s) if it were to be fired from rest in outer space with the same amount of fuel? Assume the fuel burns at a constant rate. m/s

A rifle with a weight of 35 N fires a 5.5-g bullet with a speed of 270 m/s. (a) Find the recoil speed of the rifle. 0.386 x m/s (b) If a 675-N man holds the rifle firmly against his shoulder, find the recoil speed of the man and rifle. m/s