A Superball Colliding Inelastically with a Table

[MirandaLeigh]

Homework Statement

As shown in the figure, a superball with mass M equal to 50 grams is dropped from a height of h₁ . It collides with a table, then bounces up to a height of h₂ . The duration of the collision (the time during which the superball is in contact with the table) is T=15ms . In this problem, take the positive y direction to be upward, and use g=9.8 for the magnitude of the acceleration due to gravity. Neglect air resistance.

previously in other parts of the problem I found that the y component of the momentum, of the ball immediately before the collision was P_{before y} =-0.27 kg*m/s and that the y component of the momentum of the ball after the collision was P_{after y}=0.22 kg*m/s

I have to find the y component of the time-averaged force F_avgy, in Newtons, that the table exerts on the ball

Homework Equations

I'm actually having problems figuring out what equations to use is all, the equations for force that my teachers given us for force don't use time, at least not yet.

The Attempt at a Solution

N/A Can't figure out the formula

 

[wavingerwin]

Use impulse (change in momentum) formula:

F_ave = I/\Deltat

where I is the impulse i.e. final momentum minus initial momentum