Tyler stands at rest on a skateboard. he has a mass of 120 kg. his friend (m = 60 kg) jumps into his arms at a speed of 2 m/s. if tyler catches his friend, how fast will they move on the skateboard?

The cerebellum controls? thirst sensations sleep-wake cycles hand-eye coordination heart rate and pulse

Lightning is an example of what phenomenon? a release of a large amount of energy an absorption of a large amount of energy a natural electric circuit a natural electric current

Aparticle's position is given by x = 3.00 - 9.00t + 3t2, in which x is in meters and t is in seconds. (a) what is its velocity at t = 1 s? (b) is it moving in the positive or negative direction of x just then? (c) what is its speed just then? (d) is the speed increasing or decreasing just then? (try answering the next two questions without further calculation.) (e) is there ever an instant when the velocity is zero? if so, give the time t; if not, answer "0". (f) is there a time after t = 3 s when the particle is moving in the negative direction of x? if so, give the time t; if not, answer "0".