A 5 kg object with speed of `30 m//s` strikes a steel plants at an angle `45^(@)` and rebound at the same speed and same angle (Fig. 3.43). Calculate.
(a) the magntiude of the change is momentum of the object and

(b) the change in the magnitude of the momentum of the object.

Answer

(a) `300sqrt(2) kg m//s`, (b) zero

Explanation

(a)
`|vecP_(i)| = |vecP_(f)|= P("say")`
`therefore" "|DeltavecP|= Psqrt(2)" "(because vecP_(1)botvecP_(2))`
(b) `|vecP_(i)|= |vecP_(f)|`
`therefore" "Delta|vecP|=0`