An airplane touches down at the extreme end of a 2000 m runway and decelerates uniformly at a rate of 2 m/s2. The plane stops at the other end of the runway. Determine... a. the plane’s velocity as it began to land
b. the amount of time the landing roll required.

The great sandini is a 60.0-kg circus performer who is shot from a cannon (actually a spring gun). you don’t find many men of his caliber, so you him design a new gun. this new gun has a very large spring with a very small mass and a force constant of 1100 n/m that he will compress with a force of 4400 n. the inside of the gun barrel is coated with teflon, so the average friction force will be only 40.0 n during the 4.00 m he moves in the barrel. at what speed will he emerge from the end of the barrel, 2.50 m above his initial rest position?