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Q.

Calculate the maximum acceleration of a moving car so that a body lying on the floor of the car remains stationary. The coefficient of static friction between the body and the floor is 0.15 (g = 10 m s-2)

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a

1.5m s-2

b

1.2 m s-2

c

50 m s-2

d

150m s-2

answer is D.

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Detailed Solution

detailed_solution_thumbnail

Pseudo force should be balanced by friction f = ma

 ⇒f≤ff=μN=μmg⇒ma≤μmg ⇒amax=μg=(0.15)×10=1.5ms−2

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