14.The car has managed to drive with uniform velocity of 5m/s for 10minutes,instaneous speed of car at t=500s

solution:

In the above question, car is travelling with 5m/s for 10minutes.

here he mentioned instantaneous speed ,that means at particular instant how much velocity it has.

it has travelled for 10minutes,that means through the journey it is travelling with uniform velocity.

so, answer is at t=500s also same speed.