A 68.0-kg person throws a 0.0495-kg snowball forward with a ground speed of 31.0 m/s. A second person, with a mass of 58.0 kg, catches the snowball. Both people are on skates. The first person is initially moving forward with a speed of 3.40 m/s, and the second person is initially at rest. What are the velocities of the two people after the snowball is exchanged? Disregard the friction between the skates and the ice. (Take the direction the snowball is thrown to be the positive direction. Indicate the direction with the sign of your answer.) thrower     m/s (Give your answer to at least three decimal places.) catcher     m/s

Two friends are playing pool at arcade center. One guy hit the cue ball to strike at another ball where it is initially at rest. After the collision caused by the ball that was at rest, the cue ball moves at 2.50 m/s along a line making an angle 0-14.0° with its original direction of motion and the second ball has a speed of 1.50 m/s. Find the answer for Part a,b and c. Part A: Find the angle e between the direction of the motion of the second ball and the original direction of motion of the cue ball. Part B: Find the cue ball's original speed? Part C: Figure out whether kinetic energy is conserved?

A car of mass 1000.0 kg moving at 20.0 m/s collides with a 5000.0 kg truck at the initial velocity of 10.0 m/s. After the collision, the car stops. Neglecting friction, what is the velocity of the truck after the collision? 20 m/s 10 m/s 8.0 m/s 12 m/s 10.0 m/s 14 m/s

For a safe reentry into Earth's atmosphere, the pilots of a space capsule must reduce their speed from 2.60 x 104 m/s to 1.10 × 104 m/s. The rocket engine produces a backward force on the capsule of 1.80 x 105 N. The mass of the capsule is 3280 kg. For how long must they fire their engine? Ignore the change in mass of the capsule due to the expulsion of exhaust gases.

The figure shows a glancing (not head-on) collision between two billiard balls (viewed from above). Ball 1 is initially moving with 2.0 m/s in the positive x direction; ball 2 is initially moving with 1.0 m/s in the opposite direction. After the collision, ball 2 moves at 1.41 m/s in the negative y direction. a) What are the direction (the angle θ from the x axis) and speed of ball 1 after the collision? b) Is this an elastic collision? If not, what fraction of the original energy is lost in the collision?

A 45.0-kg girl is standing on a 149-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 1.49 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

Two blocks with masses m1 = 0.20 kg and m2 = 0.60 kg start at opposite ends of a frictionlessU-shaped track, although not necessarily at the same height as one another. After being released from rest,they slide down the track and then collide with one another where the track is level. After the collision,both blocks are at rest. Block 1 descends a total height h1 = 36 cm. The collision between blocks takes 0.06 s. Find the magnitude of the average force of block 2 on Block1 Is energy conserved during the collision? Support your answer with a conceptual argument or acalculation. Find the value of h2, the height that block 2 descended.

A 60-kg swimmer suddenly dives horizontally to the left from a 100-kg raft with a speed of 2.5 m/s. The raft is initially at rest. What is the velocity of the raft immediately after the diver jumps?

A 170-g billiard ball is shot toward an identical ball at velocity vi = 6.90 m/s.The identical ball is initially at rest. After the balls hit, one of them travels with velocity v1, f = (1.65 + 2.10) m/s. What is the velocity of the second ball after the impact? Ignore effects of friction during this process. (Express your answer in vector form.)

Two masses are held against springs, each are compressed by 25.0 cm. Both are released from rest, travel across the frictionless ground, and stick together when they collide. Find the velocity (magnitude and direction) of both masses right after the collision. m2 = 350 g ki = 42.5 N/m k2 = 30.0 N/m m, = 200 g 25.0 cm 25.0 cm 9.