Question 9 of 20 A 0.55 kg basketball moving 6.3 m/s to the right collides with a 0.06 kg tennis
ball moving 35 m/s to the left. After the collision, the tennis ball is moving
39.5 m/s to the right. What is the velocity of the basketball after the collision?
Assume an elastic collision occurred.
A. 14.4 m/s to the left
B. 14.4 m/s to the right
C. 1.8 m/s to the left
D. 1.8 m/s to the right

Aparticle's position is given by x = 3.00 - 9.00t + 3t2, in which x is in meters and t is in seconds. (a) what is its velocity at t = 1 s? (b) is it moving in the positive or negative direction of x just then? (c) what is its speed just then? (d) is the speed increasing or decreasing just then? (try answering the next two questions without further calculation.) (e) is there ever an instant when the velocity is zero? if so, give the time t; if not, answer "0". (f) is there a time after t = 3 s when the particle is moving in the negative direction of x? if so, give the time t; if not, answer "0".