Question

A body covers half the distance with a speed of 20m/s and the other half with a speed 30m/s find the average speed of the whole journey​

Answer 1

Answer:

24

Explanation:

because average speed=2 x v1 x v2/v1 + v2

that is 2 x 20 x 30 / 2o+30=24m/s

Answer 2

Solution :

⏭ Given:

✏ A body covers half the distance with a speed of 20mps and the other half with a speed of 30mps.

⏭ To Find:

✏ Average speed during whole journey

⏭ Concept:

✏ Average speed is defined as ratio of total distance travelled to the total time taken.

⏭ Formula:

✏ If body covers first half of total distance with speed V1 and final half of total distance with speed V2, then average speed is given by

$\star \: \underline{ \boxed{ \bold{ \sf{ \pink{ \large{v_{av} = \frac{2v_1v_2}{v_1 + v_2}}}}}}} \: \star$

⏭ Calculation:

$\mapsto \sf \: v_{av} = \dfrac{2 \times 20 \times 30}{20 + 30} \\ \\ \mapsto \sf \: v_{av} = \dfrac{1200}{50} \\ \\ \mapsto \: \underline{ \boxed{ \bold{ \sf{ \orange{ \large{v_{av} = 24 \: mps}}}}}} \: \gray{ \bigstar}$

⏭ Additional information:

• Average speed is scalar quantity.
• Average velocity is vector quantity.