Question

A bus starting from rest attains 1 point
a velocity 72km/hr in 5 min. if
the acceleration is uniform, its
acceleration is... (in m/s2)
O 1/30
O 1/15
O
0.24
O 1.5
​

Answer 1

Answer:

answer is 1 by 15 because initial velocity is 0 and final velocity will be 20m per sec and time will be 300 seconds by using formula a = (v-u)by t as accelation is uniform the answer will be 1 by 15

Answer 2

Given :

Initial velocity of bus = zero (i.e., rest)

Final velocity of bus = 72km/hr

Time interval = 5min = 300s

To Find :

Acceleration of the bus.

Solution :

★ What is acceleration :-

• Acceleration is defined as the rate of change of velocity.
• It is a vector quantity having both magnitude as well as direction.
• It can be positive, negative or zero.
• SI unit : m/s²
• CGS unit : cm/s²

First of all we need to convert unit of velocity into metre per second.

We know that, 1 kmph = 5/18 mps

• 72 kmph = 72 × 5/18 = 20 mps

Formula : $\underline{\boxed{\bf{\purple{a=\dfrac{v-u}{t}}}}}$

By substituting the given values;

➛ a = (v - u) / t

➛ a = (20 - 0) / 300

➛ a = 20/300

➛ a = 1/15 m/s²

∴ (B) is the correct answer!