Question

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Answer 1

Answer:

Here is ur answer

we have , u=80, v=60, t=5s

Therefore , a=?

we know that v=u+at

60=80+a×5

60-80=5a

-20=5a

=>a=-20/5

=>a=-4

Hope it helps u☺☺

Answer 2

${\boxed{\boxed{u = 80 \: {kmh}^{ - 1} \: \: = > \: \: \frac{400}{18} \: {ms}^{ - 1}}}} \\ \\ {\boxed{\boxed{v = 60 \: {kmh}^{ - 1} \: \: = > \: \: \frac{300}{18} \: {ms}^{ - 1}}}} \\ \\{\boxed{\boxed{ t = 5 \: sec}}}$

Now,

$a = \frac{v - u}{t} \\ \\ \: \: \: = \frac{ \frac{300}{18} - \frac{400}{18} }{5} \\ \\ \: \: \: = \frac{ \frac{ - 100}{18} }{5} \\ \\ \: \: \: = \frac{ - 100}{18 \times 5} \\ \\ \: \: \: = \frac{ - 20}{18} \: \: {ms}^{ - 2}$

Hence,

${\boxed{\red{\boxed{ \large{Acceleration \: \: of \: \: bus \: \: is \: \: \frac{ - 20}{18} \: \: {ms}^{ - 2} }}}}}$

${ \Huge{Or,}}$

${\boxed{\boxed{u = 80 \: {kmh}^{ - 1} \: \: = > \: \: 22.2 \: {ms}^{ - 1} }}\\ \\{\boxed{\boxed{ v = 60 \: {kmh}^{ - 1} \: \: = > \: \: 16.6 \: {ms}^{ - 1}}} } \\ \\ {\boxed{\boxed{t = 5 \: sec}}}}$

Now,

$a = \frac{v - u}{t} \\ \\ \: \: \: = \frac{16.6 - 22.2}{5} \\ \\ \: \: \: = \frac{ - 5.6}{5} \\ \\ \: \: \: = - 1.12 \: \: {ms}^{ - 2}$

Hence,

${\boxed{\red{\boxed{ \Large{Acceleration \: \: of \: \: bus \: \: is \: \: - 1.12 \: \: {ms}^{ - 2} }}}}}$

$<marquee>MARK BRAINLIEST$