To overcome an object's inertia, it must be acted upon by
a. gravity
b. energy
c. force
d. acceleration

Aboat that travels with constant speed of 6.10 m/s in still water is to go directly across a river. the current in the river flows at 1.95 m/s. (a) at what angle must the boat be steered?

What is a neurotransmitter involved in mood reward, addiction, and motor behaviors?

Consider a system to be two train cars traveling toward each other. what is the total momentum of the system before the train cars collide?   kg • what must the total momentum of the system be after the train cars collide?   kg •