Freddy Frog drops vertically from a tree onto a horizontally moving skateboard. The skateboard slows. Give two reasons for this, one in terms of a horizontal friction force between Freddy’s feet and the skateboard, and one in terms of momentum conservation.

Mitch throws a 132—gram lump of clay at a 636 g target, which is at rest on a horizontal surface. After impact, the target slides 5.5 m before stopping. If the coefficient of friction is 0.68, find the speed of the clay before impact.

Questions 4 through 6 pertain to the situation described below: A 31.0-kg skateboarder rides on a 10.0-kg skateboard at 5.7 m/s on a level road before jumping into air with a speed of 10.0 m/s against the ground in the direction of 27.0° above the forward, horizontal direction to leave the skateboard. Ignore air resistance and the friction between the road and skateboard. (4) What is the maximum height that the skateboarder can reach? (A) 1.05 m; (B) 1.25 m; (C) 1.45 m; (D) 1.65 m; (E) 1.85 m. (5) What is the speed of the skateboard on the ground after the jump? (A) 3.85 m/s; (B) 4.05 m/s; (C) 4.25 m/s; (D) 4.45 m/s; (E) 4.65 m/s. (6) What is the minimum work done by the skateboarder to make the jump? (A) 994 J; (B) 974 J; (C) 954 J; (D) 934 J; (E) 914 J.

In an attempt to imitate Miley, Betty White launches herself onto a wrecking ball. If she is moving at 6 m/s when she jumps on the ball, how high does the ball swing? Assume: mbetty = 60 kg (~140 lbs) 450 kg (~1000 Ibs) Mball And that the initial velocity is purely in the horizontal direction, and the support chain of the wrecking ball has negligible mass. a) Solve for the maximum swing height symbolically b) Solve for the maximum swing height numerically c) If the wrecking ball support chain has a length of 5 meters, what angular displacement does the ball have from vertical at the highest point?

A volleyball player starts a serve by throwing the ball vertically upward. The 240g volleyball comes to rest at its maximum height. The server then hits it and exerts an average horizontal force of magnitude 6.2 N on the ball. Determine the speed of the ball after the player hits it if the average force is exerted on the ball for 600 ms.

A 80-kg fisherman in a 133-kg boat throws a package of mass m = 15 kg horizontally toward the right with a speed of v; = 4.0 m/s as in the figure below. Neglecting water resistance, and assuming the boat is at rest before the package is thrown, find the velocity of the boat after the package is thrown. magnitude m/s direction ---Select--- m

During an ice show a 75.0 kg skater leaps into the air and is caught by an initially stationary 85.0 kg skater. (a) What is their final velocity in meters per second assuming negligible friction and that the 75.0 kg skater's original horizontal velocity was 4.00 m/s? (Enter a number.) m/s (b) How much kinetic energy is lost in joules? (Enter a number.) J

You’re an accident investigator at a scene where a drunk driver in a 2200 kg car has plowed into a 1400 kg parked car with its brake set. You measure skid marks showing that the combined wreckage moved 20 m before stopping, and you determine a frictional coefficient of 0.78. What do you report for the drunk driver’s speed just before the collision?

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Blocks A, B, and C are aligned along a straight line on a horizontal frictionless surface. The masses of the blocks are M, 3M and 4M, respectively. Block A is initially moving to the right along the same line at a speed v, as shown in the figure. Blocks B and C are initially at rest. Block A collides with and sticks to block B. The two blocks then collide with and stick to block C. What is the speed of * ?block C after the collisions Block A Block B Block C 8v v/4 0. v/3 O v/8 O