Which statement best describes the motion of the crate? a) the crate must be at rest. b) the crate must be moving with constant velocity. c) the crate must be moving with constant acceleration. d) the crate may be either at rest or moving with constant velocity. e) the crate may be either at rest or moving with constant acceleration.

How have the competing explanations' experiments on atoms affected the development of the atomic model?

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 790 n/m. it is initially at rest on an inclined plane that is at an angle of 28 degrees with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is k = 0.14. in the initial position, where the spring is compressed by a distance of a = 0.18 m, the mass is at its lowest position and the spring is compressed the maximum amount. take the initial gravitational energy of the block as zero. b) if the spring pushes the block up the incline, what distance, l, in meters will the block travel before coming to rest? the spring remains attached to both the block and the fixed wall throughout its motion.

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