Hunk traveled 540 km at an average speed of 90 km/h. If tim completed the same amount of distance with 1 hour and 30 min less than hunk, what was tim's average speed for the whole journey?

Inelastic is the answer your looking for.

Gravity, from the center of mass of the box, extending downward normal force, from the floor under the box, extending upward, equal to gravity push force, acting at a point on the box, extending in the direction of motion friction, acting at any point on the box directly opposite the push, extending directly opposite to the motion

Because its not moving at that time hope u understand

Answeronly the mass of a black hole