Need Help with Momentum and Impulse?!?! Need some one smart...... The only formulas that were provided were 1. I =Δp 2. mΔv 3. I=FΔt 4. KE= 1/2 mv^2 5. PE= mgΔh 6. ΔPE= ΔKE 7. W= F*D 8. W= ΔKE Momentum Before Collision = Momentum After Collision 9. m`av`a + m`bv`b = m`av`a + m`bv`b Elastic Collision 10. m`av`a + m`bv`b = m`av`b(v) inelastic collision The little apostrophe are for subscripts, e.g. m`a, meaning "m" is normal, but the a is a subscript. Questions 1. A tennis ball may leave the racket of a top player on the serve with a speed of 65 m/s. If the ball's ,*** is .06 kg and it is in contact with the rackt for .03 secs, what is the average force on the ball? 2. A .145 kg basball pitched at 39 m/s is hit on a horzontal line drive straight back towards the pitcher at 52 m/s. If the contact time betwween bat and ball is 1.00 E-3 sec, calculate the average force between the bat and ball contact.