B) Power
Because Power= Work/time
Answer:
Explanation:
We are not told where A and B are, but I'll assume that they are two points on the orbit of earth about the sun.
As that orbit is an ellipse, the two points likely do not have the same distance between the earth and sun.
As gravity varies with the inverse of the square of the distance (F = GMm/d²), the force at the closer distance will be greater than the force at the longer distance.
Answer:
a. Yes, because the acceleration of the crate is 2.0 m/s².
Explanation:
Given
--- f
--- m
--- t
--- v
Required
Does the system support 
Yes, it does and this is shown below
The crate is initially at rest; so:

Using the first equation of motion

Substitute values for v, u and t


Make a the subject


Using 
Substitute values for F and m

Divide both sides by 3



In both cases:

<em>Hence, option (a) is correct.</em>
Answer:
B
Explanation:
hair can be a safety hazard