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A spring is stretched 0.2 m by a force of 40 N. What is the spring constant?

Which of the following is true about conservative forces?

If the velocity of a body doubles, its kinetic energy becomes:

A 2 kg object falls 5 m. What is its speed just before hitting the ground (neglect air resistance)?

 If the net work done on an object is positive, what happens to its kinetic energy?

A 2 kg object swings in a vertical circle of radius 1.5 m. At the lowest point, speed is 8 m/s.What is the tension in the string at the lowest point?

Which of the following is the correct unit of work?

A 3 kg object moving at 6 m/s collides and sticks to a stationary 2 kg object. What is their final velocity?

A 5 kg box is pushed 6 m across a rough floor by a 30 N force applied at a 30° angle above horizontal. The coefficient of kinetic friction between the box and floor is 0.2.How much net work is done on the box?

Which of the following is conserved when no external torque acts on a system?