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3 ms2
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10.8 ms-2
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10.8 ms2
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3 ms-2
A car accelerates uniformly from 18 kmh^-1 to 72 kmh^-1 in 5 s. The acceleration of the car is:
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CONCEPT:
Acceleration (a):
Where v2 = velocity of an object at time t2 and v1 = velocity of an object at time t1
CALCULATION:
Given that,
⇒ Initial velocity of the car (u) = 18 km/h
⇒ Final velocity of the car (v) = 72 km/h
⇒ Acceleration is defined as change in velocity with respect to time i.e. a = vf/t
⇒ Change in velocity is final velocity – initial velocity (vf)= 72- 18 ⇒ 54 Km/h = 54 × 5 /18
⇒ 15 m/s.
⇒ Acceleration of the car (a) = 15/5 = 3m/s2.
⇒ Therefore, the acceleration of the car (a) = 3m/s2 or 3 ms-2