2. [4 points, 25%] A tennis ball, travelling horizontally, collides elastically with a solid wall and rebounds backwards. The collision last 6 ms. The force felt by the tennis ball in that time is Fnet = 53e-(t-3) and the peak force the ball feels is 53 N. See the graph below: In which direction is the tennis ball moving when it strikes the wall? Accurately (i.e. with numbers) sketch theF net us. t graph for the wall. What is the impulse felt by the ball? The following integral and table of error-function values might be of some assistance: A "- 1) at - 4 47 ert (B-t.) - ef (B - 1,) erf(n) 0.5 0.520499877813047 1.0 0.842700792949715 1.5 0.966105146175311 2.0 0.995322265018953 2.5 0.999593047982555 3.0 0.99997 7909503001 3.5 0.999999256901628 1.0 0.999999984582742 4.5 0.999999999803384 5.0 0.999999999998463 5.5 0.999999999999993 6.0 IV. The wall will crack if it experiences a peak force of 150 N. Set up the equation needed to solve in order to find the minimum time interval that won't crack the wall. Hint: If you assume the collision happens at t - 0 s, then B