A scooter starting from rest moves with a constant acceleration for a time Δt₁ , then with a constant velocity for the next Δt₂ and finally with a constant deceleration for the next Δt₃ to come to rest. A 500 N man sitting on the scooter behind the driver manages to stay at rest with respect to the scooter without touching and other part. The force exerted by the seat on the man is

• A

  500N throughout the journey

• B

  less the 500 N throughout the journey

• C

  more than 500 N throughout the journey

• D

  > 500 N for time Δt₁ and Δt₃ and 500N for Δt₂