If this impulse delivered to the ball in 0.020 seconds, then what is magnitude of the force acting between the are hand and the ball?

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 •  

Aboy with a mass 25 kg climbs into a small tree. he sits on a branch that is 2.o m above to the ground.what is his gravitational potential energy above the ground?

What is the relationship between the direction of motion of the balloon and the wind currents