Two ice skaters stand face to face and "push off" and travel directly away from each other.  The boy has a velocity of 5 m/s and he weighs 750 N.  The girl weighs 480 N.  What is the girl's velocity?

Big Boris (90kg) skates backward, 1.0 meter ahead of small skater Sofia (45 kg) , holding her hand as they travel 3.0 "/s . At the 30-second mark, Boris starts pulling Sofia past him, so that by 32.0 s she is 1.0 m ahead of him. During that move, what was Sofia's average velocity, relative to Boris? -0.5 m/s -2.0 m/s +2.0 m/s -1.0 m/s +0.5 m/s +1.0 m/s

A car (VW) and a truck (C) collide inelastically (stick together). The impact is made in a very short time of t= 0.1 s. Initial speed Vvw=40.0 m/s Cv=30 m/s Masses mvw = 900.0 kg mc = 2000.0 kg Find the final velocity of the vehicles. Find the average acceleration of each vehicle Find the average force over each vehicle. Find the initial kinetic energy. Find the final kinetic energy.

A 2.00 kg ball falls off a 200.00 cm high wall. If the time during the collision is 0.050 seconds, what is the force of impact caused by the ground on the ball? USE SIGNIFICANT FIGURES in the answer!

A baseball player hits a bunt during which the bat is in contact with the ball for 0.0005 s. If the bat applies a force of 3,000 N to the 0.15 kg baseball, what is the change in the ball's velocity? Your answer should be in units of m/s but you should only submit the number for your answer (and don't worry about negative signs, just use a positive value).

A hockey player slaps a puck into a cushion, which brings the puck to rest.  If the puck's initial velocity was +40 m/s and it has a mass of 170 g, what force does the cushion apply to the puck?  Assume the cushion acts on the puck for 0.03 s and the surface that the puck slides on is frictionless.

Two ice skaters stand together as illustrated in Figure (a). They "push off" and travel directly away from each other, the boy with a velocity of v = +0.42 m/s. If the boy weighs 718 N and the girl 450 N, what is the girl's velocity after they push off? (Consider the ice to be frictionless.)

What is the magnitude of the average force, in newtons, exerted on a 0.0295-kg bullet to accelerate it to a speed of 590 m/s in a time of 1.85 ms?

Your mass is 92.6 kg, and the sled s mass is 17.1 kg. You start at rest, and then you jump off the sled, after which the empty sled is traveling at a speed of 3.11 m/s. What will be your speed on the ice after jumping off? 0.57 m/s 0.46 m/s 1.03 m/s 0.80 m/s

A high-speed photograph of a club hitting a golf ball is shown in the figure below. The club was in contact with a ball, initially at rest, for about 0.0024 s. If the ball has a mass of 55 g and leaves the head of the club with a speed of 1.9 x 102 ft/s, find the average force (in kN) exerted on the ball by the club. kN