Question

Question #1180e

Answer 1

Deceleration`=8ms^-2`.

Explanation:

Using the following kinematic equation connecting quantities of interest, also assuming it is constant deceleration
`v=u+at`
where `vand u` are final and initial velocities respectively, `a` is acceleration and `t` is the time.

Inserting given values we get
`0=80+axx10`
Rearranging we get
`10a=-80`
Solving for `a`,
`a=-8ms^-2`