Question

If a bus at rest accelerates uniformly to a speed of 126 km/h
in 15 seconds, find the distance covered by it in this time.​

Answer 1

Answer:

Given –

• Speed of the bus = 126 km/hr.
• Time = 15 seconds

To Find –

• Distance travelled.

Solution –

We know, Speed = Distance/Time.

Hence, Distance = Speed * Time.

Now, let us convert the speed in m/s.

➸ 226 * 5/18

➸ 7 * 5

➸ 35 m/s

Hence, Speed in m/s is 35 m/s.

➸ Distance = 35 * 15

➸ Distance = 525 m

➸ Distance = 0.525 km

Hence, the distance travelled by the bus is approximately 0.5 kilometers.

TERMINOLOGY :–

• Distance is the total path travelled by the body.
• Displacement is the shortest distance between the initial position and the final position of the body.
• Distance can be equal to displacement or greater than displacement.
• Displacement is a vector quantity and distance is a scalar quantity.
• The rate of change of distance is called the speed of the body.
• The rate of change of displacement is called the velocity of the body.
• Speed is a scalar quantity and velocity is a vector quantity.
• The rate of change of velocity is called acceleration of the body.