Question

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

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

Answer 1

The correct option is A an acceleration

As the coin falls behind him, the horizontal distance covered by the coin is less than the horizontal distance covered by the passenger.
$s_{coin}<s_{passenger}$
$ut<ut+\frac{1}{2}{a}_{train}{t}^2$
$\Rightarrow a_{train}>0$
Hence, the train must be moving with acceleration.