Question

A body with mass `1kg` moves in one direction in the presence of a force which is described by the potential energy graph. If the body is releasd from rest at `x=2 m`, than its speed when it crosses `x=5 m`, is (Neglect dissipative forces).

A. `2sqrt2 ms^(-1)`
B. `1 ms^(-1)`
C. `2 ms^(-1)`
D. `3 ms^(-1)`

Answer 1

Correct Answer - A
`K_(i) + U_(i) =K_(f) + U_(f)`
`:. 0 + 6=(1)/(2) xx 1 xx v^(2) + 2`
`:. v =2sqrt(2) m//s`