4. A truck with mass of 3000 kg traveling with a velocity of 15 m/s hits a car at rest. After the collision, the truck moves with a velocity of 10 m/s. If the car has a mass of 2000 kg and
the two vehicles do not stick together, how fast is the car moving after the collision? Is this
an elastic or inelastic collision?

An object resting on a table weighs 100 n. with what force is the object pushing on the table? with what force is the table pushing on the object? explain how you got your answer.

During the experiment if you could triple the breakaway magnetic force with all other quantities left unchanged, what is the new value for the critical velocity if it was v0 (initial velocity), initially? (b) now if you halved the radius with all other quantities left unchanged, what is the new critical velocity if it was v0 (initial velocity), initially? (c) if during the experiment, critical velocity quadrupled with all other quantities left unchanged, what is the new breakaway force if its magnitude was initially f0,?

A1.5m wire carries a 2 a current when a potential difference of 52 v is applied. what is the resistance of the wire?