For an elastic collision, which of the following statements are true?
choose all that apply
a) kinetic energy is conserved.
b) momentum is gained.
c) kinetic energy is gained.
d) momentum is lost.
e) momentum is conserved.
f) kinetic energy is lost.

In which of the following cases is work being done on an object? question 2 options: pulling a trailer up a hill carrying a box down a corridor suspending a heavy weight with a strong chain pushing against a locked door

Suppose that 27 j of work is needed to stretch a spring from its natural length of 6 m to a length of 9 m. (a) how much work is needed to stretch the spring from 12 m to 14 m? j (b) how far beyond its natural length will a force of 78 n keep the spring stretched?

Which is an example of an exothermic process?