Atrooper is moving due south along the freeway at a speed of 23 m/s. at time t = 0, a red car passes the trooper. the red car moves with constant velocity of 51 m/s southward. at the instant the trooper's car is passed, the trooper begins to speed up at a constant rate of 2.1 m/s2. what is the maximum distance ahead of the trooper that is reached by the red car?

Acarpenter is driving a 15.0-g steel nail into a board. his 1.00-kg hammer is moving at 8.50 m/s when it strikes the nail. half of the kinetic energy of the hammer is transformed into heat in the nail and does not flow out of the nail. what is the increase in temperature of the nail after the three blows that the carpenter needs to drive the nail in completely? the specific heat of steel is 448 j/kg ∙ k. a) 2.7 k b) 1.8 k c) 7.7 k d) 8.1 k e) 3.6 k