The answer should be C.
Ratio it has two radioactive isotopes is compared by overtime.
Hope it helped you.
-Charlie
Answer:
(a) Magnitude of force is 262.51 N
(b) Angle with East direction is 
Explanation:
Force by Jack in vector form
Force by Jill in Vector form is given by

Force by Jane is

Net force is:

Hence

The net force will be given by

Since
and 

The direction of net force is:

Since
and

The angle with East direction is 
Net force exerted on the donkey is in the south-east direction. So, the angle of net force from the east direction is
and it is
from the south.
Answer:
Visible, or infrared lights
distance is metres in any direction ... displacement is distance in a given direction ... 1 mile versus 1 mile North