Energy Use with questions 1 – 4. A 2.0 x 10 3kg racecar accelerates from 25 m/s to a speed of 55 m/s in 8.0 seconds.

1. What was the kinetic energy of the racecar before it accelerated? KE = J
2. What was the kinetic energy of the racecar after it accelerated? KE = J
3. How much work was done by the racecar in accelerating? W = J
4. Ignoring drag, how much power was developed by the racecar in accelerating?

Choose a realistic problem for which these are the correct freebody diagrams. be sure that the answer that the problem requests is consistent with the diagrams shown. choose a realistic problem for which these are the correct freebody diagrams. be sure that the answer that the problem requests is consistent with the diagrams shown. a 1.0 kg block is placed on top of a 2.0 kg block. a horizontal rope pulls the 2.0 kg block across a frictionless floor with a force of 21.0 n. the coefficient between the two blocks is 0.75. does the 1.0 kg block on top slide?