Question

Question #cb30b

Answer 1

(a) Using the kinematic expression
`v^2-u^2=2as` and inserting given values in SI units we get
`v^2-(7.0)^2=2xx0.71xx1033`
`v^2=49+2xx0.71xx1033`
`v=sqrt(49+2xx0.71xx1033)=38.9ms^-1`, rounded to one decimal plave

(b) We can use the following kinematic expression here
`v=u+at`
as velocity `v` is attained after moving a distance of `1.033km`
`=>t=(v-u)/a` and inserting given values we get
`t=(38.9-7.0)/0.71=45s` rounded to nearest second.