Question

A car travels from point A to B covering a distance of 50m in 5s and then from B to C.

It covers a distance of 20m in 2s. Calculate its average speed.

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Answer 1

Answer:

10 m/s

Explanation:

As per the provided information in the given question, we have :

• A car travels from point A to B covering a distance of 50m in 5s and then from B to C it covers a distance of 20m in 2s.

We are asked to calculate average speed.

Average speed refers to the total distance covered divided by total time to cover the distance.

$\bigstar \; \boxed{ \rm{Speed_{(Avg)} = \dfrac{Distance_{(Total)}}{Time_{(Total)}} }}$

Now, by using this formula,

$\longmapsto \rm { Speed_{(Avg)} = \dfrac{Distance_{(Total)}}{Time_{(Total)}} } \\ \\ \longmapsto \rm{Speed_{(Avg)} = \dfrac{(50 + 20) \; m}{(5 + 2) \; s}} \\ \\ \longmapsto \rm{Speed_{(Avg)} =\cancel{ \dfrac{70\; m}{7 \; s}}} \\ \\ \longmapsto \underline{\boxed{\rm{Speed_{(Avg)} = 10 \; m \; s^{-1} } }} \; \bigstar$

∴ The average speed is 10 m/s.

$\underline{ \qquad\qquad\qquad\qquad\qquad\qquad\qquad\qquad}$

More Information :

• Speed is defined as distance covered per unit time.
• Its SI unit is m/s.
• It is a scalar quantity.
• Speed = Distance/Time
• It is denoted of by v.