Question

PROBLEM: A bus increases its speed from 20 km/hr to 50 km/hr in 10 seconds. Find its acceleration?
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Answer 1

Given :

➛ Initial speed = 20kmph

➛ Final speed = 50kmph

➛ Time interval = 10s

To Find :

፨ Acceleration of bus.

Concept :

➾ Acceleration is defined as the rate of change in speed.

➾ It is a vector quantity.

➾ It has both magnitude as well as direction.

➾ It can be positive, negative or zero.

➾ SI unit : m/s

Conversion :

◕ 3600s = 1h

◕ 10s = 10/3600 = (1/360)h

Calculation :

⇒ $\sf{a=\dfrac{v-u}{t}}$

⇒ $\sf{a=\dfrac{(50-20)\times 360}{1}}$

⇒ $\sf{a=30\times 360}$

⇒ $\underline{\boxed{\bf{a=10800\:kmh^{-2}}}}$

Answer 2

Given,

Initial speed = 20kmph

Final speed = 50kmph

Time =10sec

To Find:-

Acceleration

calculations:-

a=v-u/t

a = (50-20)×360/1

a=30×360

a=10800kmh^-2

Explore More:-

Acceleration:-

• Acceleration is a vector quantity that is defined as the rate at which an object changes its velocity.

• Acceleration is a vector quantity.

Unit:- m/s^2