During a 7.0 second interval, an object’s velocity changes from 74 m/s East to 32 m/s East. What is the magnitude and direction of the object’s acceleration?

Suppose that 27 j of work is needed to stretch a spring from its natural length of 6 m to a length of 9 m. (a) how much work is needed to stretch the spring from 12 m to 14 m? j (b) how far beyond its natural length will a force of 78 n keep the spring stretched?