Test yourself 3: Two forces of 60 N and 80 N respectively act simultaneously at a point.
Sketch and determine their resultant by using the following methods:
a) tail-to-head
b) tail-to-tail (122 N 25°)​

wire in brush may conduct electricity from cell to drill and vice versa electrc shock possible

the part of the wave he is travelling on is the crest

that would be because of both gravity and friction. so     c