Acar travels from boston to hartford in 4 hours. the two cities are 240 kilometers apart. what was the average speed of the car during the trip? a. 4 km/hour b. 960 km/hour c. 60 km/hour

Suppose a force of 60 n is required to stretch and hold a spring 0.1 m from its equilibrium position. a. assuming the spring obeys hooke's law, find the spring constant k. b. how much work is required to compress the spring 0.5 m from its equilibrium position? c. how much work is required to stretch the spring 0.6 m from its equilibrium position? d. how much additional work is required to stretch the spring 0.1 m if it has already been stretched 0.1 m from its equilibrium? a. kequals 600