How much work is done when 100 N of force is applied to a rock to move it 20 m

Using the work energy theorem. what is the velocity of a 850kg car after starting at rest when 13,000j of work is done to it.

At time t=0, a particle is located at the point (3,6,9). it travels in a straight line to the point (5,2,7), has speed 8 at (3,6,9) and constant acceleration 2i−4j−2k. find an equation for the position vector of the particle.

If element x has 99 protons how many electrons does it have