Answer :

There is no relative movement between the man and the seat during the time ∆t2. So, the normal force applied by the seat on the man is 500N only.

However, during the time ∆t1 and ∆t3 i.e. during acceleration and deacceleration respectively, the seat provides extra frictional force on the man in horizontal direction. Hence it will be greater than 500N.

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