81°.
The law of reflection states that the angle of incidence is equal to the angle of reflection.
Answer:
Fa = -Ff provided that the angle between Fa and Ff is zero
Explanation:
Since the net force is zero, the sum of adding all external forces onto the cart must be zero.
Assuming there is no other forces acting on the cart and Fa acting in the same plane as Fc (i.e. zero angle between acting forces),
Fa + Ff = 0
Hence
Fa = -Ff
Explanation:
well its depends for example one car might be going down the hilll and the other up a hill and there the velocity can change between the cars because of gravity so one can be going faster and the other slower.
element z are isotopes because number of netron are different and number of protons are same