A box of mass m sliding with an initial speed of v on a rough horizontal surface runs into a fixed spring of elastic constant k, compressing it a distance x1 = x from its relaxed position while momentarily coming to rest. There is NO FRICTION. What would be the right equation for energy balance in this example ?

When you jump from an elevated position you usually bend your knees upon reaching the ground. by doing this, you make the time of the impact about 10 times as great as for a stiff-legged landing. in this way the average force your body experiences is a) less than 1/10 as great. b) more than 1/10 as great. c) about 1/10 as great.d) about 10 times as great.

If we relied solely on the nonrenewable resources found in the u.s., which one would we run out of first at current usage levels? a. natural gas b. oil c. uranium d. coal

Apersons beliefs and general outlook, which act like filters on the information they receive are called ?