1. A racecar's velocity decreases from 73.0 m/s to 36 m/s over a 4.5 second period. a) What is its acceleration?
b) What was the racecar's displacement?

If the force applied to an object remains constant, is more power needed for the object to move faster ? explain

Name the non metal condut electricity

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