A 115 kg hockey player, Adam, is
skating east when he tackles a
133 kg player, Bob, skating west at
-1.59 m/s. Afterward, they move
together at 0.250 m/s east. What
was Adam's velocity before the
collision?

On mars a rock falls an unknown vertical distance from a resting position and lands in a crater. if it takes the rock 2.5 seconds to fall, how high is the cliff the rock fell from? mars' surface gravity is 3.8 m/s2.