A spring with a spring constant of 100 N/m is stretched by a force of 10 N. What is the elastic PE stored in the stretched spring? a. 0.5J b. 0.3J C. 0.4J d. 0.25 J

An object moving at 21.0 m/s has 1390 J of kinetic energy. What is the object's mass? A. 6.30 kg B. 66.2 kg C. 3.15 kg D. 33.1 kg

A 63 kg diver is standing on a diving board waiting to commence her dive. The diving board has compressed 8.0 cm. a. Determine the maximum height the diver will reach. Include a system and FBD in your work. b. What will happen to the diver's height with each successive jump? Explain why.

Sara used a sling shot to hunt a bird. She stretched the rubber band 5cm when she applied 2 N force. How much elastic potential energy is stored in the sling shot ? A. 0.05 J B. 0.075 J C. 0.45 J D. 0.25 J

5. A 60 kg circus performer is swinging from a trapeze bar.A: She is 10 m off the ground with a speed v1. The spring-board platform below her is atits equilibrium length.B: She lets go of the trapeze bar and lands on th spring-board platform, which compresseswhen she lands on it. When she is stationary, she is 2 m off the ground and the springis maximally compressed.C: The spring-board extends and launches her back into the air. As soon as the spring istotally relaxed again, the performer is 3 m off the ground and has a speed v2.D: The performer lands on a platform 10 m above the floor, and she stands stationary. a. Her initial speed v1 = 10 m/s. What is her total energy at point A?  b. Between points A and B, assume none of her energy is lost to heat or friction. Whenshe is stationary on the compressed platform at B, how much energy is stored in thespring-board platform?  c. When the spring-board platform is fully released at point C, what must her speed v2 be?

2. An object has 560 J of potential energy and 890 J of mechanical energy. How much kinetic energy does the object have?. ME = REHPE 560 560 330J= PE olog ertev 3. A slingshot rubber band with a spring constant of 850 N/m was stretched 0.33 m. A 0.4 kg rock was fired from the slingshot after it was released. a. Find the spring potential energy. PE =)2 kx? Z(850X.33) b. What is the kinetic energy of the stone once it was released? PEERE c. What is the velocity of the stone as soon as the slingshot was released?

Question 6 When a student stretches a spring, what is the flow of energy? a. Energy goes into the spring and into the student. X b. There is no change in the energy of the spring, only for the student. c. There is no change in the energy of the student, but there is a change for the spring. d. Envery leaves the spring and goes to the student. e. Energy goes into the spring from the student.

3. A 10-Newton object moves to the left at 1 m/s. Its kinetic energy is approximately ____ Joules if you double the speed. a. 0.5 b. 1 c. 10 d. 20  4. Which best describes potential energy? a. Energy as heat b. stored energy c. energy that is used to do work d. energy of motion.

4. A 6.00 Kg iron ball moves at 2.75 m/s. How fast must a 2.65 g steal ball move so that the two balls have the same kinetic energy?

5. A 0.085kg toy popper, the plastic kind made from a spring and a suction cup, is compressed 0.03m towards the tabletop. It releases and "pops" up to a maximum height of 0.35m above the tabletop. a. What is the potential energy at its highest point? b. What was the kinetic energy when it left the tabletop? c. How fast was it moving when it left the tabletop? d. How much elastic potential energy was in the popper spring when it was compressed? e. What is the spring constant of the spring in the popper?