Part A A 2.75 kg bale of hay with an initial speed of 1.75 m/s slides along the ground, moving 40.0 cm before coming to rest. Find the coefficient of kinetic friction between the ground and the bale of hay.

Part B
If the bale of hay had been traveling twice as fast, what distance would it have skidded, under the same conditions?
It would have skidded 4 times farther.
It would have skidded one half as far.
It would have skidded one-fourth as far.
It would have skidded twice as far.
It is impossible to tell from the information given.

Amerry-go-round of radius r, shown in the figure, is rotating at constant angular speed. the friction in its bearings is so small that it can be ignored. a sandbag of mass m is dropped onto the merry-go-round, at a position designated by r. the sandbag does not slip or roll upon contact with the merry-go-round. how would you rank the following different combinations of m and r on the basis of the angular speed of the merry-go-round after the sandbag "sticks" to the merry-go-round from largest to smallest. a) m = 10kg, r = 0.25r b) m = 20kg, r = 0.25r c) m = 10kg, r = 0.50r d) m = 10kg, r = 1.0r e) m = 15kg, r = 0.75r f) m = 40kg, r = 0.25r