Question

the speed of a bus increases from 25 km/h to 70 km/h in 5 seconds. Find the mean acceleration of the bus.

Answer 1

HEY MATE HERE IS UR ANSWER

GIVEN THAT SPEED OF BUS INCREASES FROM 25KM/H TO 70KM/H IN 5 SECONDS.

THEREFORE

INITIAL VELOCITY ( VELOCITY DURING FIRST POINT OF REFERENCE ) (U) = 25KM/H

FINAL VELOCITY ( VELOCITY DURING LAST POINT OF REFERENCE ) (V) = 70 KM/H

NOW CONVERTING INITIAL AND FINAL VELOCITY IN M/S

WE HAVE

25 KM/H × 5/18 = 6.95 m/s

70 KM/H × 5/18 = 19.45 m/s

TIME TAKEN BY BUS = 5 SECONDS

NOW ACCELERATION

=. V - U / TIME

(19.45 - 6.95) / 5s

= 12.50 / 5

2.5 m/s^2

There for ACCELERATION = 2.5 M/ s^2

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