A racket ball is struck in such a way that it leaves the racket with a speed of 4.88 m/s in the horizontal direction. When the ball hits the court, it is a horizontal distance of 1.96 m from the racket. Find the height of the racket ball when it left the racket.

J. j. thomson’s experiment disproved the theory that an atom

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 •  

Visualize the problem and identify special cases first examine the problem by drawing a picture and visualizing the motion. apply newton's 2nd law, ∑f⃗ =ma⃗ , to each body in your mind. don't worry about which quantities are given. think about the forces on each body: how are these consistent with the direction of the acceleration for that body? can you think of any special cases that you can solve quickly now and use to test your understanding later? one special case in this problem is if m2=0, in which case block 1 would simply fall freely under the acceleration of gravity: a⃗ 1=−gj^.