1. 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

There are two-speed cameras, one in an are where the speed limit is 30 km/h and another where the speed limit is 50 km/h. in which will there be a smaller time interval between the photographs? explain your answer.

If a rock is thrown upward on the planet mars with a velocity of 12 m/s, its height (in meters) after t seconds is given by h = 12t − 1.86t2. (a) find the velocity of the rock after two seconds. m/s (b) find the velocity of the rock when t = a. 12−3.72a m/s (c) when will the rock hit the surface? (round your answer to one decimal place.) t = s (d) with what velocity will the rock hit the surface? m/s

Madison pushes with a 210-n horizontal force on a 24-kg crate of coffee resting on a warehouse floor. the force of friction on the crate is 74 n. what is the acceleration?