Question

Question #afec9

Answer 1

`-0.75ms^-2`

negative value indicates slowing down or deceleration or retardation.

Explanation:

Kinematic equation connecting values of interest is
`v=u+at`
where `u and v` are the initial and final velocities respectively, `a` is acceleration and `t` is time taken for the change. It is assumed that we are dealing with constant acceleration.

Inserting given values we get
`15=24+axx12`
Rearranging and Solving for `a` we get
`12a=15-24`
`=>a=-cancel9^3/cancel12_4`
`=>a=-0.75ms^-2`

As expected negative value indicates slowing down or deceleration or retardation.