Question

A passenger in a moving train tosses a coins. If the coin falls behind him, the train must be moving :

• A. With a uniform speed
• B. With a deceleration
• C. With an acceleration
• D. Any of the above.

Answer 1

The correct option is C With an acceleration

After tossing the coin $goes$ into air so only thing it possess is the velocity of train at the moment of $tossing.$

So if the train is moving with constant speed so the coin will come down to the $same$ place because its $horizontal$ velocity remained constant.

Now if the train has $acceleration$ in forward direction then it will more $horizontal$ distance compared to the coin

moving with constant $horizontal$ velocity, the vertical velocity of the coin will decide its time of flight.

So the answer is C because the coin fall behind.