Question

A passenger in a moving train tosses a one-rupee coin. If the coin falls behind him, then the train must be moving with a uniform
1. Acceleration
2. Deceleration
3. Speed
4. Velocity

Answer 1

Correct Answer - Option 1 : Acceleration

The correct answer is Acceleration.

• When the coin toss, it has the same velocity as the velocity of the train but during the time, the coin is in the air, the velocity of the train keeps on increasing, and hence it falls behind the passenger.
• Acceleration
  • It is the time rate of change of velocity of a body.
  • It is a vector quantity.
  • Its SI unit is m/s2.

 

• Deceleration
  • When the velocity of a body decreases with time, then acceleration becomes negative.
  • Negative acceleration is also called deceleration or retardation.
• Speed
  • The rate of change of position of the object in any direction is called the speed of the object.
  • It is a scalar quantity.
  • Its SI unit is m/s.
  • Speed= Distance travelled/Time taken
• Velocity
  • The time rate of change of displacement of a body is called its velocity.
  • It is a vector quantity.
  • Its SI unit is called m/s.
  • Velocity can be positive or negative.