Kinematics question - Physics?

Question

A linebacker gets a running start and crosses the line of scrimmage just as the ball is snapped. He hits the quarterback traveling at 8m/s at 5.0m behind the line of scrimmage. If the linebacker accelerates at 1.5m/s^2:

a) What was his velocity when he crossed the line of scrimmage?

b) How long after the ball was snapped did he hit the QuarterBack?

Answer 1

you have the final velocity, the distance, and the acceleration, and you are looking for the initial velocity...so you can use the equation (final velocity square)-(initial velocity square) = 2 a d

once you have your 2 velocities you can do the s = (u +v)/2 * t to get your time