A Sunset student, whose mass is 60 kg, is standing at the top of a 50 meter hill on a snowy day. The student
slips on some ice and slides to the bus stop, which is a
vertical drop of 8 meters. (a) What is the student's
speed when they reach the bus stop at the bottom of
the hill? (b) Draw what an ENERGY PIE CHART (like the
skate park) would look like at 4 meters down the hill.
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In which of the following cases is work being done on an object? question 2 options: pulling a trailer up a hill carrying a box down a corridor suspending a heavy weight with a strong chain pushing against a locked door

Abaseball is thrown from the outfield toward the catcher. when the ball reaches its highest point, which statement is true? (a)its velocity is not zero, but its acceleration is zero. (b) its velocity and its acceleration are both zero. (c) its velocity is perpendicular to its acceleration. (d) its acceleration depends on the angle at which the ball was thrown. (e) none of the above statements are true.

In a game of pool, ball a is moving with a velocity v0 of magnitude v0 = 15 ft/s when it strikes balls b and c, which are at rest and aligned as shown. knowing that after the collision the three balls move in the directions indicated and assuming frictionless surfaces and perfectly elastic impact (that is, conservation of energy), determine the magnitudes of the velocities va, vb, and vc.