Take the direction of east to be positive and west to be negative. What is the average acceleration of a jet ski that goes from rest (0 m/s) to 12 m/s east in 3 seconds? Remember: acceleration is the change in velocity divided by time.

A. +4 m/s2 E

B. -4 m/s2 E

C. +0.25 m/s2 E

D. -0.25 m/s2 E

The long handle on a rake is a(n) a. lever b. screw c. wedge d. inclined plane

Imagine that you have two balloons (or, better yet, actually inflate two balloons, if possible). create static electricity around one of the balloons by rubbing it against your hair or your sweater and then bring that balloon close to the other balloon, which has not been charged. try this with at least one other object—and for variety in the discussion, avoid using an object already described by your classmates. then, for your initial post to the discussion, answer the following questions: what happened with the two balloons?

Suppose that 27 j of work is needed to stretch a spring from its natural length of 6 m to a length of 9 m. (a) how much work is needed to stretch the spring from 12 m to 14 m? j (b) how far beyond its natural length will a force of 78 n keep the spring stretched?