4. A car starts from rest and attains a velocity of 18Km/hr in 2 seconds. The acceleration of the car is (a) 5/2 m/s b) 2/5 m/s c) -5/2 m/s2 d) None of these
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Explanation:
18km/hr=18*1000/3600=5m/sec
a=v-u/t
=5-0/2
=5/2m/s^2
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