Answer:
80 angle of incidence=angle of reflection
Explanation:
80 angle of reflection!
Because it is a flat, smooth surface it will reflect like that of a normal plane mirror, so the angle of reflection will be equal to that of the angle of incidence!
Hope this helps you understands!
but why was it thrown is the real question
y(i) = h
v(y.i) = 0
See attachment for elaboration
562.5J
The following were obtained from the question:
F = 45N
d = 12.5m
w =?
The work done can be achieved by using
w = F x d
w = 45 x 12.5
w = 562.5J
m=41 kg
v=0,02 ms
R=2,1 m
F-?
a=v²/R
a=(0,02) ²/2,1=0,0002
F=m*a
F=41*0,0002=0,0082 H
F=0,0082 H