A block slides up a frictionless, inclined plane with (Fig. P4.83). (a) If the block re...

A block slides up a frictionless, inclined plane with (Fig. P4.83). (a) If the block reaches a maximum height h = 4.5 m, what was the initial speed of the block? (b) Now consider a second inclined plane with the same tilt angle and for which the coefficient of kinetic friction between the block and the plane is What initial speed is now required for the block to reach the same maximum height?