With an average acceleration of $- 1.2$ $-1.2$ $m$ $m$ $/$ $/$ $s^{2}$ $s^2$ , how long will it take a cyclist to bring a bicycle with an initial speed of $6.5$ $6.5$ $m$ $m$ $/$ $/$ $s$ $s$ to a complete stop?

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Answer 1 · 2017-01-27T15:18:41

time =5.41s

$a = - 1.2 \frac{m}{s^{2}}$ $a=-1.2m/s^2$
$v_{i} = 6.5 \frac{m}{s^{2}}$ $v_i=6.5m/s^2$
$v_{f} = 0$ $v_f=0$
$Delta t$ =?

we use formula

$a=(v_f-v_i)/t$

$-1.2=(0-6.5)/t$
$t=5.41s$

With an average acceleration of -1.2−1.2-1.2 mmm///s^2s2s^2, how long will it take a cyclist to bring a bicycle with an initial speed of 6.56.56.5 mmm///sss to a complete stop?