One type of toy car contains a spring that is compressed as the wheels are rolled backward along a surface. The spring remains compressed until the wheels are freed and the car is allowed to roll forward. Jose learns that if he rolls the car backward for a greater distance (up to a certain point), the car will go faster when he releases it. The spring compresses 1.00 cm for every 10.0 cm the car is rolled backward. (a) Assuming the spring constant is 146.0 N/m, what is the elastic potential energy stored in the spring when Jose rolls the car backward 18.0 cm? 2.3652 x Your response is off by a multiple of ten. J (b) What is the elastic potential energy stored in the spring when he rolls the car backward 45.5 cm? 25.1128 Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. J (c) Explain the correlation between the results for parts (a) and (b) and Jose's observations of different speeds.Both a car (m. = 1650 kg) and a truck (m, = 7800 kg) are initially at rest and are each sped up to a final speed of 20 mph. (a) What is the final kinetic energy of the car? (b) What is the final kinetic energy of the truck