Question

Question #59015

Answer 1

`17600" pdl"`

Explanation:

In FPS system of units
`30" mph"=30xx5280/3600=44 " ft s"^-1`
Using the kinematic equation connecting quantities of interest: initial velocity `u`, final velocity `v`, acceleration `a` and time `t`

`v=u+at`

Inserting given quantities
`44=0+axx8`
`=>a=44/8=5.5" ft s"^-2`

From Newton's Second Law of Motion we know that Force `F=massxxa`

Inserting given and calculated values we get

`F=3200xx5.5=17600" pdl"`