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Q. A cart starts from position 4 in the figure below with a velocity of 16.7 m/s to the left. As shown, h4 = 20.9 m, h3 = 11.5 m, and h2 = 17.0 m. Find the speed with which the cart reaches positions 3, 2, and 1 (in that order). Neglect friction. Let g = 9.81 m/s2.

Q. A 2.60 bullet moving at 270 enters and stops in an initially stationary 2.60 wooden block on a horizontal frictionless surface.

What's the speed of the bullet block combination?

What fraction of the bullet's kinetic energy was lost in this perfectly inelastic collision?

How much work was done in stopping the bullet?

If the bullet penetrated 5.00 into the wood, what was the average stopping force?

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