7. When an object undergoes uniform circular motion. the direction of the (K)acceleration is: directed tangent to the circle directed toward the centre of the circle changing depending on its position in the circle directed outward from the centre of the circle opposite to the direction of centripetal force sheave ------- 8.A car travels with a constant speed around a curve in the road. The curve is banked. Which of the following forces is in the direction of the net force on the car? (K) the x-cornponent of the force of gravity the frictional force the x-component of the normal force the force of gravity the centrifugal force $099.09) 9. A spring with a force constant of 150.0 me was stretched 5.7 cm. The work done to stretch the spring was (K) a. 0.24 J d. 860 J b. 8.6 J e. 2400 J c. 430 J