If you have a mass of 65kg how many newtons would you weigh on earth (F=ma)

Identical marbles are released from the same height on each of the following four frictionless ramps . compare the speed of the marbles at the end of each ramp. explain your reasoning

Find v(t), given acceleration a(t)=7j and initial velocity v(0)=k

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 •