Acceleration is best defined as the rate of change of of an object. a. position b. force c. speed d. velocity 2. which of the following describes acceleration? a. s/m b. m/s c. m/s2 d. m2 3. which of the following is the main difference between speed and velocity? a. speed has direction and velocity b. speed is measured over time c. velocity has both speed and direction d. speed is constant

Ablock of mass m = 2.5 kg is attached to a spring with spring constant k = 710 n/m. it is initially at rest on an inclined plane that is at an angle of θ = 23° with respect to the horizontal, and the coefficient of kinetic friction between the block and the plane is μk = 0.19. in the initial position, where the spring is compressed by a distance of d = 0.16 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. a) what is the block's initial mechanical energy? 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 drives toward the right over the top of a hill, as shown below. which arrow represents the centripetal acceleration? w x y z

Acar travels in reverse. it covers 150 meters in 12 seconds what is the velocity of the car what is the speed of the car