# Question #59015

Jan 23, 2017

$17600 \text{ pdl}$

#### Explanation:

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

$v = u + a t$

Inserting given quantities
$44 = 0 + a \times 8$
$\implies a = \frac{44}{8} = 5.5 {\text{ ft s}}^{-} 2$

From Newton's Second Law of Motion we know that Force $F = m a s s \times a$

Inserting given and calculated values we get

$F = 3200 \times 5.5 = 17600 \text{ pdl}$