Which of the following is NOT a vector quantity? A a frictional force of 50 N against the tires

B an unstable star with a temperature of 100 B Kelvin

C a truck going up the hill at 40 mph

D a skydiver accelerating 9.8 m/s2 downward

Acar traveling at 22 m/s starts to decelerate steadily. it comes to a complete stop in 15 seconds. what is it’s acceleration?

The man of mass m1 and the woman of mass m2 are standing on opposite ends of the platform of mass m0 which moves with negligible friction and is initially at rest with s = 0. the man and woman begin to approach each other. derive an expression for the displacement s of the platform when the two meet in terms of the displacement x1 of the man relative to the platform.

An impulse is the product of the on an object and time during which it is applied