Question

Question #9cde2

Answer 1

`6s`

Explanation:

Find the acceleration using N"L then use one of the constant acceleration eqns

`F=-50N" "m=20kg`

N2L

`F=ma`

`-50=20a=>a=-50/20=-2.5ms^(-2)`

using `v=u+at`

`0=15+(-2.5t)`

`t=15/2.5=6 s`