10. A bus decreases its speed from 80 km/h to
60 km/h in 5 s. Find the acceleration of the
bus.
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Answer:
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Explanation:
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The acceleration of bus is .
Explanation:
- Since, bus is going with the constant velocity of 80 Kmph. We assume, this is initial velocity.
- But, We are asked that the bus is slowed down to speed 60 kmph. We assume that it is final speed.
- In this case, we can see that both velocities are constant. So Newton's law is applicable .
- Therefore, we write as;
u = 80 kmph, v = 60 kmph, t = 5 sec , a = ?
It means, we should apply.
- v = u +at
We can covert the kmph in mps, by multiplying the number by 5/18.
Now, u = 900/18 mps, v = 50/3 mps, t = 5 seconds
Put the values in v = u + at.
By solving it, we get;
- a =
Thus, the acceleration of bus is .
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