Question

13. An object travels 24 m with a speed of 4 m/s and then another 32 m with speed of 8 m/s. The average speed of the object is (a) 6 m/s (b) 4 m/s (c)5.6 m/s (d) 6.5 m/s ​

Answer 1

Given:

An object travels 24 m with a speed of 4 m/s and then another 32 m with speed of 8 m/s.

To find:

Average speed ?

Calculation:

• Average is calculated by dividing the total distance with total time.

$\sf \: avg. \: v = \dfrac{total \: distance}{total \: time}$

$\sf \implies\: avg. \: v = \dfrac{24 + 32}{ \dfrac{24}{4} + \dfrac{32}{8} }$

$\sf \implies\: avg. \: v = \dfrac{56}{ 6 + 4 }$

$\sf \implies\: avg. \: v = \dfrac{56}{ 10 }$

$\sf \implies\: avg. \: v = 5.6 \: m {s}^{ - 1}$

So, average speed is 5.6 m/s