3. A cart at rest at the top of a roller coaster has 1000 J of
potential energy. The roller coaster goes down one hill and up
another smaller hill. If it has 400 J of potential energy at the
top of the second hill, how much kinetic energy does it have?
A)OJ B) 250 J
C) 600J
D) 1400 J E) 400000 J

An ideal spring has a spring constant (force constant) of 2500 n/m, is stretched 4.0 cm, how much elastic potential energy does it possess? (a) 3j (b) 0.00j (c) 1j (d) 2j (e) 4j

If a spring has a k value of 100 newtons per meter and it is stretched 0.50 meters, what is the restoring force of the spring?

Question 11 of 13 (1 point) jump to question: a stairway, ladder, or ramp must be present in excavations in which of the following situations? a. all trenches must have access/egress b. the trench is more than 15 feet wide but only 1 ½ feet deep c. the trench is more than 4 feet deep and the devices must be within 25 feet of all workers