An astronaut of mass 80 kg is floating at rest in outer space and carries a hammer of mass 3.0 kg. She throws the hammer away from her, giving it a speed of 40 m/s. What is the astronaut's speed after throwing away the hammer? A: 2.0 m/s B 6.0 m/s C40 m/s D 10 m/s E 1.5 m/s

Ft = m Av p = mv J = Ft What is the average momentum of a 50 kg runner who covers 400 m in 50 s?

A mine car (mass=430 kg) rolls at a speed of 0.50 m/s on a horizontal track, as the drawing shows. A 110-kg chunk of coal has a speed of 1.0 m/s when it leaves the chute. Determine the speed of the car-coal system after the coal has come to rest in the car. 25.0° 110 kg 1.0 m/s 430 kg 0.50 m/s

Your mass is 73.3 kg, and the sled s mass is 10.1 kg. You start at rest, and then you jump off the sled, after which the empty sled is traveling at a speed of 5.48 m/s. What will be your speed on the ice after jumping off?     0.38 m/s     1.22 m/s     0.99 m/s     0.76 m/s

A 10-m-long glider with a mass of 680 kg (including the passengers) is gliding horizontally through the air at 20 m/s when a 60 kg skydiver drops out by releasing his grip on the glider. What is the glider's speed just after the skydiver lets go?

5. The figure shows three balls of clay moving on a frictionless horizontal surface just before a collision. The three collide simultaneously and stick together. Find the speed and direction of the blob of clay after the collision. Draw the blob after the collision and show its velocity vector. 40 g 45° 4.0 m/s 3.0 m/s 30 g 2.0 m/s 20 g

Three identical train cars, coupled together, are rolling east at speed v0v0. A fourth car traveling east at 2v0v0 catches up with the three and couples to make a four-car train. A moment later, the train cars hit a fifth car that was at rest on the tracks, and it couples to make a five-car train.What is the speed of the five-car train?

You find yourself stuck in outerspace with nothing but your physics book and spacesuit. You have a mass of 108kg in your suit and your physics book has a mass of 3.7 kg. In order to make it back to your stationary spaceship before running out of air you must move at .29 m/s. How fast in m/s do you have to throw your physics book to achieve the speed

A 52 kg cart rolls down a 5.0 meter tall hill.  What is the velocity of the cart at the bottom of the hill? (neglect friction) Group of answer choices 8.8 m/s 9.9 m/s 7.9 m/s 8.2 m/s 7.4 m/s      PreviousNext

A stationary soccer ball of mass m = 0.72 kg is kicked with a constant force of F = 29 N. The woman's foot is in contact with the ball for t = 0.24 s a) Write an expression for the speed of the ball, vi, as it leaves the woman's foot. (b) What is the velocity of the ball right after contact with the foot of the woman?