Chelsey is traveling from Route 62 to the school entrance at a constant speed of 22.5 m/s when she is stopped by a red light at Endicott Road. She decelerates at -3.95 m/s2, waits for 45.0 seconds before the light turns green and accelerates back up to her previous speed at 4.9 m/s2. Determine the total time required to decelerate, stop and accelerate back up to speed.

How much work is done lifting a 9.10 kg box straight up onto a shelf that is 1.80 m high?

Moon effect. some people believe that the moon controls their activities. if the moon moves from being directly on the opposite side of earth from you to being directly overhead, by what percentage does (a) the moon's gravitational pull on you increase and (b) your weight (as measured on a scale) decrease? assume that the earth–moon (center-to-center) distance is 3.82 × 10^8 m, earth's radius is 6.37 × 10^6 m, moon's mass is 7.36 × 10^22 kg, and earth's mass is 5.98 × 10^24 kg.

At time t=0, a particle is located at the point (3,6,9). it travels in a straight line to the point (5,2,7), has speed 8 at (3,6,9) and constant acceleration 2i−4j−2k. find an equation for the position vector of the particle.