Question

a bus decreases its speed from 80 km per hour to 60 km per hour in 15 seconds find the acceleration of the bus​

Answer 1

ACCELERATION = ${\huge{\frac{</strong><strong>Change</strong><strong>\</strong><strong>:</strong><strong>in</strong><strong>\</strong><strong>:</strong><strong>velocity</strong><strong>}{</strong><strong>Time</strong><strong>}}}$

ACCELERATION = ${\huge{\frac{</strong><strong>8</strong><strong>0</strong><strong>-</strong><strong>6</strong><strong>0</strong><strong>}{</strong><strong>1</strong><strong>5</strong><strong>/</strong><strong>6</strong><strong>0</strong><strong>}}}$

ACCELERATION = ${\huge{\frac{</strong><strong>2</strong><strong>0</strong><strong>*</strong><strong>6</strong><strong>0</strong><strong>}{</strong><strong>1</strong><strong>5</strong><strong>}}}$

ACCELERATION = 80kmhr^-2

Answer 2

initial velocity of the bus is 80km/h=u

final velocity of the bus is 60km/h=v

15 sec =3600/15=240

a=v-u/t

a=60-80/240

=-20/240

=-1/12

a=0.834

hope this helps you

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