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Answer :
Given, mass of the car (m) = 1200 kg
When the third person starts pushing the car, the acceleration (a) is \( 0.2m/s^2 \) .
\(\therefore \) The force applied by the third person (F) = ma
\(\Rightarrow F = 1200 × 0.2 m/s^2 = 240 N \)