Which statement best defines work? (2 points) Group of answer choices Work is the time it takes to move an object once acted upon by a force. Work occurs when balanced forces act on an object and cause movement in the direction of these forces. Work occurs when a force causes motion of an object, and this motion is in the same direction of the applied force. Work is the distance over time that an object moves once acted on by a force.

The experiment done in lab is repeated, using a ball that has unknown mass m. you plot your data in the form of f 2 versus m/l, with f in rev/s, m in kg, and l in m. your data falls close to a straight line that has slope 3.19 m/(kg · s2). use g = 9.80 m/s2 and calculate the mass m of the ball.

The direction of the current in an alternating current circuit remains constant. is direct. changes repeatedly. changes randomly.

Visualize the problem and identify special cases first examine the problem by drawing a picture and visualizing the motion. apply newton's 2nd law, ∑f⃗ =ma⃗ , to each body in your mind. don't worry about which quantities are given. think about the forces on each body: how are these consistent with the direction of the acceleration for that body? can you think of any special cases that you can solve quickly now and use to test your understanding later? one special case in this problem is if m2=0, in which case block 1 would simply fall freely under the acceleration of gravity: a⃗ 1=−gj^.