1. Why is it harder to overcome the inertia of a bowling ball than a baseball? A. because the bowling ball is larger B. because the bowling ball...

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6. Acceleration (instantaneous or average) is of courseC. change in speed ÷ time.

Therefore 4. (280 km/s) / (7 s) = 40 (km/s)/s, C.

1. It is not clear whether a balls considered at rest or moving at their usual speeds. In the first case "overcome the inertia" means "make a ball move with some speed" of course mass is a measure of inertia, and the answer is B...

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6. Acceleration (instantaneous or average) is of course
C. change in speed ÷ time.

Therefore 4. (280 km/s) / (7 s) = 40 (km/s)/s, C.

1. It is not clear whether a balls considered at rest or moving at their usual speeds. In the first case "overcome the inertia" means "make a ball move with some speed" of course mass is a measure of inertia, and the answer is B.

But in the second case "overcome the inertia" probably means "stop a ball moving with usual speed" and the answer depends on momentum, which may be greater of any ball. So the answer is C if it is known that "is it harder to overcome the inertia of a bowling ball than a baseball".

2. The friction force depends on the properties of the surfaces and the pressure force (against the surface). So A is irrelevant, in the cases B and D the friction would decrease and in C it would increase. The answer is C.

5. Momentum and acceleration aren't forces, so the answer is A.