The figure below shows a fisherman in a rowboat on a lake. The fisherman's mass is 78 kg, and the rowboat's is 122 kg. The fisherman and rowboat are initially at rest when the fisherman throws a package of mass  m = 15 kg  horizontally to the right with a speed of  vi = 4.9 m/s.  What is the velocity of the rowboat after the package is thrown? Neglect any resistance force from the water

A 45.0-kg girl is standing on a 139-kg plank. The plank, originally at rest, is free to slide on a frozen lake, which is a flat, frictionless surface. The girl begins to walk along the plank at a constant velocity of 1.47 m/s to the right relative to the plank. (Let the direction the girl is moving in be positive. Indicate the direction with the sign of your answer.) (a) What is her velocity relative to the surface of ice? = ____ m/s   (b) What is the velocity of the plank relative to the surface of ice? = _____ m/s

A 0.05 kg ball strikes a wall with a velocity v1 = -25 m/s and bounces back with a velocity v2 =5 m/s. If the collision lasts 0.2 s, then find the average force (in N) exerted on the ball.

A 59.5 kg man standing on a frictionless surface pushes two large boxes in opposite directions as shown. Initially everything is a rest. If the left box has mass 41.5 kg and final speed 3.25 m/s, and the right box has mass 27.0 kg and final speed 2.00 m/s, what is the final velocity (magnitude and direction) of the man? Let the positive direction be to the right.

A skater of mass 72.5 kg initially moves in a straight line at a speed of 4.80 m/s. The skater approaches a child of mass 35.0 kg, whom he lifts on his shoulders. Assuming there are no external horizontal forces, what is the skater's final velocity?

. The fisherman's mass is 79 kg, and the boat's is 126 kg. The fisherman and boat are initially at rest when the fisherman throws a package of mass m = 15 kg horizontally to the right with a speed of vi = 4.9 m/s. What is the velocity of the boat after the package is thrown? Neglect any resistance force from the water. (Give the magnitude in m/s, and select the correct direction from the options given.)  What is the direction of the boat?

A hockey stick exerts an average force of 39 N[S] on a 0.20 kg hockey puck over a displacement of 0.22m. If the hockey puck started from rest, what is the final velocity of the puck? Assume that the friction between the puck and the ice is negligible.

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 0.6 Kg football is thrown with a velocity of 22 m/s to left. A stationary receiver catches the ball and brings it to rest in 0.03 s. What is the force exerted on the ball by the receiver? Show the procedure, result with units and direction

A 76.1 kg astronaut of holding a 12.3 kg tool pack while drifting at 10.6 m/s to the right. She throws the tool pack away so that it is drifting at 1.5 m/s to the left. How fast is she moving after the throw? Assume that they are out in deep space with no other forces acting on them.