Find the work w1 done on the block by the force of magnitude f1 = 60.0 n as the block moves from xi = -3.00 cm to xf = 1.00 cm

The frequencies refer to the sample data collected from a population of interest when performing a hypothesis test comparing two or more population proportions.

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 •  

Which situation will produce the greatest change of momentum