1. in which direction can a force be exerted on an object?

a. any direction

b. up, down, left, right

c. depends on the acceleration of the object

2. based on newton’s first law of motion, which of the following is true?

a. objects at rest stay at rest until acted upon by a force

b. no forces are necessary to accelerate an object

c. only balanced forces can accelerate an object

Arunner is jogging at a steady 3.6 km/hr. when the runner is 2.9 km from the finish line, a bird begins flying from the runner to the finish line at 14.4 km/hr (4 times as fast as the runner). when the bird reaches the finish line, it turns around and flies back to the runner. even though the bird is a dodo, we will assume that it occupies only one point in space, i.e., a zero-length bird. how far does the bird travel? (b) after this first encounter, the bird then turns around and flies from the runner back to the finish line, turns around again and flies back to the runner. the bird repeats the back and forth trips until the runner reaches the finish line. how far does the bird travel from the beginning? (i.e. include the distance traveled to the first encounter)