Automobile's acceleration? (Remember, a negative value indicates slowing down or deceleration
4) A parachute on a racing dragster opens and changes the speed of the car from 85 m/s to 45 m/s in a
period of 4.5 seconds. What is the acceleration of the dragster?

Apotter's wheel moves uniformly from rest to an angular speed of 0.20 rev/s in 32.0 s. (a) find its angular acceleration in radians per second per second. rad/s2 (b) would doubling the angular acceleration during the given period have doubled final angular speed?

Debris produced by mining is called

Two identical stars with mass m orbit around their center of mass. each orbit is circular and has radius r, so that the two stars are always on opposite sides of the circle. (a) find the gravitational force of one star on the other. (b) find the orbital speed of each star and the period of the orbit. (c) how much energy would be required to separate the two stars to infinity?