II. Solve the following numerical:
⦁ A car starts from rest and attains a velocity of 18 km/h in 2 s. Find its acceleration in SI units.
⦁ A driver decreases the speed of a car from 25 m/s to 10 m/s in 5 seconds. Find the acceleration of the car.
⦁ A bus decreases its speed from 80 km/h to 60 km/h in 5 minutes (1/12 hour). Find the acceleration of the bus in km/h.
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Explanation:
1)a=velocity/time
we should convert 18 km/h into m/sec for this we should multiply with 5/18
v=18×5/18
=5m/s
a=5/2m/s^2
2)a=change in velocity/time
change in velocity = 10-25=-15m/s
a=-15/5
a=-3m/s^2 it is decelerating
3)a=change in velocity/time
change in velocity =60-80=-20km/h
a=-20/(1/12)
a=-240km/h
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