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A bus decreases its speed from $80 km / h to 60 km / h in 5 \sec$ . Then the acceleration of the bus is__?

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- 144000 km / h²

1.1 km / h²

- 1.1 km / h²

144000 km / h²

answer is A.

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Detailed Solution

A bus decreases its speed from

80 km / h to 60 km / h in 5 \sec

. Then the acceleration of the bus is

- 144000 km / h²

. (Negative sign represents the retardation)
Initial speed,

u = 80 km / h

Final speed,

v = 60 km / h

Time = 5 \sec

= \frac{5}{3600} h

From the equation of motion
We know that

v = u + at

........................equation (1)
Putting all the values in equation (1),
⇒

60 = 80 + a \times \frac{5}{3600}

⇒

a = - 14400 km / h²

(As the body is retarding)
Hence, the acceleration is

- 144000 km / h²

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