Question

A student starts with velocity of 40km/hr for School at 4km away from his house. Due to closing of school he returers soon house with velocity 60 km/hr . what is the average velocity ​

Answer 1

Answer:

•Total Distance travelled by the student is 4 + 4 km = 8 km, as he started his journey from his house to school and back to his house from school.

• Velocity at the starting of journey = 40 km

• And velocity of the student when he returns back from his school = 60 km/h.

• We need to find the Average Velocity.

• To calculate average velocity we will use the given below formula :

$\longrightarrow\:\sf Average \: Velocity = \dfrac{Total \: Displacement}{Total \: time}$

• Displacement is the shortest distance travelled by the body from initial point to the final point.

• As the student starts his journey from the same point and ends his journey at the same point.

• Therefore, his total displacement will be zero.

$\longrightarrow\:\sf Average \: Velocity = \dfrac{0}{ \frac{ d_{1}}{v_{1}} + \frac{d_{2}}{v_{2}} }$

$\longrightarrow\:\bold{ Average \: Velocity = 0 \: km/h}$