Two students, standing on skateboards, are initially at rest, when they give each other a shove! After the shove, one student (78kg) moves to the left at 5.3m/s while the other student (53kg) moves right. IJI before shove: unit Ipl combined unit after shove: IP skater moving left = unit IP skater moving right= unit How fast does the student move right? unit What was the magnitude of the average force between the students if they pushed each other for 1.25s? unit A cannon, with a cannonball inside, is initially at rest. A student then fires the 22kg cannonball with a speed of 41 m/s from the unsecured 490kg cannon. UJI before collision: unit Ipl combined = un after collision: |p|cannon Ipl ball = unit unit What was the cannon's "kick-back" speed after the explosion? unit How long was the cannonball in the barrel during the launch if the average launch force was 3670N? unit A student is trying to determine the muzzle velocity (initial) of a bullet that is too fast to measure directly. The student fires the 0.04kg bullet into a 5kg block of wood initially at rest. After the collision, the block, with the bullet embedded inside moves to the right with a speed of 1.84m/s right. before collision: Ip|bullet IP block unit after collision: |p|combined unit How fast was the bullet fired? unit A 1000kg car, traveling 16m/s to the right collides with a 3000kg semi truck initially at rest. After the 0.8s collision, the semi truck ends up moving 6.1m/s right. before collision: kg m/s |p|car = kg m/s IP truck = kg m/s after collision: Ipl car kg m/s IP truck = kg m/s What direction did the car move after the collision? How fast did the car move after the collision? m/s What was the magnitude of the average impact force? N A 2000kg semi truck traveling 8.5m/s to the right collides with a 1100kg car initially at rest. After the 0.6s collision, the semi truck continues moving 4m/s right. TJI before collision: kg m/s IP truck 17000 kg m/s v Ipl car = 0 kg m/s v after collision: Ipl truck= 8000 kg m/s |p|car = 25000 kg m/s How fast did the car move after the collision? 22.72 m/s What was the magnitude of the average impact force? N