A 2600 kg SUV traveling west at 15 m/s collides head on with a 1300 kg sedan traveling east at 20 m/s. Determine the speed and direction of the two cars immediately after impact if they lock together.

A12-g wad of sticky clay is hurled horizontally at a 100-g wooden block initially at rest on a horizontal surface. the clay sticks to the block. after impact, the block slides 7.5 m before coming to rest. if the coefficient of friction between the block and the surface is 0.65, what was the speed of the clay immediately before the impact?