When a hammer strikes a nail, the nail A. exerts balanced forces that helps it from moving
B. exerts balanced forces that helps it from moving
C. exerts an unbalanced force that changes its velocity.
D. exerts an equal and opposite force back on the hammer.

Acatapult is tested by roman legionnaires. they tabulate the results in a papyrus and 2000 years later the archaeological team reads (distances translated into modern units): range = 0.4 km; angle of launch = π/5 rad; landing height = launch height. what is the initial velocity of launch of the boulders if air resistance is negligible?

What is relative velocity? in which condition is relative velocity known by adding the velocity of the first body and that of the second body

In a heat engine if 1000 j of heat enters the system the piston does 500 j of work, what is the final internal energy of the system if the initial energy was 2000 j? 1. write the equation 2.list out your known variables 3.plug the numbers into the equations 4.solve 5.write your solution statement that includes initial energy and final