to. Question 1 01:15 > - /1 E View Policies Current Attempt in Progress What is the spring constant of a spring that stores 45 J of elastic potential energy when compressed by 7.4 cm from its relaxed length? Number I Units v eTextbook and Media Ilin'l- Question 2 of 15 -/1 E 0-! View Policies Current Attempt in Progress In the gure, a frictionless roller coaster car of mass m = 971 kg tops the rst hill with speed v0 = 118 m/s at height h = 43.6 m. How much work does the gravitational force do on the car from that point to (a) point A, (b) point B, and (c) point C? If the gravitational potential energy of the car-Earth system is taken to be zero at C, what is its value when the car is at (d) B and (e) A? Fil'SI hill