Part A A block with mass 0.50 kg is forced against a horizontal spring of negligible mass, compressing the spring a distance of 0.20 m (Figure 1). When released, the block moves on a horizontal tabletop for 1.00 m before coming to rest. The spring constant k is 100 N/m. What is the coefficient of kinetic friction between the block and th ? Submit Request Answer

Part A A 55 g rock is placed in a slingshot and the rubber band is stretched. The magnitude of the force of the rubber band on the rock is shown by the graph in (Figure 1). The rubber band is stretched 30 cm and then released. What is the speed of the rock? Express your answer with the appropriate units. HÁ Vf = Value Figure < 1 of 1 Submit Previous Answers Request Answer X Incorrect; Try Again; 5 attempts remaining FSp (N) 60- Return to Assignment Provide Feedback 40- 20 x (cm) 30 10 20

A backpack full of books weighing 56.6 N rests on a table in a physics laboratory classroom. A spring with a force constant of 130 N/m is attached to the backpack and pulled horizontally, as indicated in the figure   If the spring is pulled until it stretches 2.80 cm and the pack remains at rest, what is the force of friction exerted on the backpack by the table? Does your answer to part A change if the mass of the backpack is doubled? Explain.

1. Calculate the work done on the suitcase by  F→. Express your answer with the appropriate units. 2. Calculate the work done on the suitcase by the gravitational force. Express your answer with the appropriate units. 3.Calculate the work done on the suitcase by the normal force. Express your answer with the appropriate units. 4. Calculate the work done on the suitcase by the friction force. Express your answer with the appropriate units. 5. Calculate the total work done on the suitcase. Express your answer with the appropriate units. 6. If the speed of the suitcase is zero at the bottom of the ramp, what is its speed after it has traveled 3.90 mm along the ramp? Express your answer with the appropriate units.