Question #13bdf

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Answer 1 · 2018-01-25T00:31:27

We can use the equation $v=u+at$ where:

$v=7$ $ms^-1$ (final velocity)
$u=0$ $ms^-1$ (initial velocity)
$a=7.9$ $ms^-2$ (acceleration)
$t=?$ $s$ (time)

Rearranging, $t=(v-u)/a=(7-0)/7.9=0.89$ $s$

Answer 2 · 2018-01-25T00:36:25

The time required is 0.886 s.

Use the suvat formula

$v = u + a*t$

Plug in the data and solve for t.

$7 ms^-1 = 0 + 7.9 ms^-2*t$

$7.9 ms^-2*t = 7 ms^-1$

$t = (7 ms^-1)/(7.9 ms^-2) = 0.886 s$

I hope this helps,
Steve