A toy launcher that is used to launch small plastic spheres horizontally contains a spring with a spring  constant of 50. newtons per meter. The spring is compressed a distance of 0.10 meter when the launcher is ready to launch a plastic sphere. - How much potential energy does the spring store?  - What is the restoring force on the spring?

= 7.50 m. The figure below shows a box with a mass of m = 7.10 kg that starts from rest at point A and slides on a track with negligible friction. Point A is at a height of ha A MET 3.20 m 2.00 m m ha (a) What is the box's speed at point B (in m/s)? m/s What is the box's speed at point C (in m/s)? m/s (b) What is the net work (in J) done by the gravitational force on the box as it moves from point A to point C?

A 2.0 kg rock is released from rest at a height 0f 20.0 m. Ignore air resistance and determine the kinetic energy, gravitational potential energy, and total mechanical energy at each of the following heights: 20.0, 15.0, 10.0, 5.0 and 0m

7. Car 1 has half the mass of car 2, but they both have the same kinetic energy. If the speed of car 1 is v = 10.0 m/s, what is the speed of car 2?

Review A Bookmark Stewart, Justin Physics: Unit 3- Energy / 1 of 4/ Activity 1 Task: Potential & Kinetic Energy Activity 1 of 5 At what point in this roller coaster does the roller coaster have the most gravitational potential energy? A roller coaster starts from rest at point A. The mass of the cart with O A. Point A riders is 900 kg. The motor of the roller coaster does work to get the car up the hill to point B. From point B, the car relies on energy transformations to make it through the rest of the shown portions of the roller coaster. [g=9.8 m/s²] B. Point B C. Point C O D. Point D A

Calculate the potential energy, kinetic energy, mechanical energv, velocitv, and height of the coaster at the various locations. No Friction on this Roller Coaster. mass of the roaller coaster car = 85 kg 100 start 95 Let gravity on Earth equal 10 m/s? Bcar bumper D E water F finish A B D E P.E. К.Е. M.E. 5 m/s speed height 80 m Height in meters

A 28 kg child jumps on a spring-driven pogo stick. At one point, the child stands on the stick so that only their weight pushes the spring down. If the spring compresses by 8 cm,  a) What is the spring constant of the pogo stick?b) What is the spring potential energy?

C7 17.) A 1 kg block (block A) is released from rest at the top of a 20 m long frictionless ramp that is 7 m high. At the same time, an identical block (block B) is released next to the ramp so that it drops straight down the same 7 m. Find the values for each of the following for the blocks just before they reach ground level. (a) gravitational potential energy Block A ______________ J Block B  ______________ J (b) kinetic energy Block A ____________________ J Block B ____________________ J (c) speed Block A ____________________ m/s Block B ____________________ m/s (d) momentum Block A _______________________ kg·m/s Block B _______________________ kg·m/s

A 3 kg ball falls from height of 14 m. What willbe potential energy of the ball after 1 second?  Use g = 9.8 m/s2

spring has a rest length of 0.50 m. 0.414 J of energy are used to stretch the spring to a length of 0.80 m. What is the spring constant?