SATHEE: Kinematics Question 348

Kinematics Question 348

Question: If a car covers $2 / 5 t h$ of the total distance with $v_{1}$ speed and $3 / 5 t h$ distance with $v_{2}$ then average speed is

Options:

A) $\frac{1}{2} \sqrt{v_{1} v_{2}}$

B) $\frac{v_{1} + v_{2}}{2}$

C) $\frac{2 v_{1} v_{2}}{v_{1} + v_{2}}$

D) $\frac{5 v_{1} v_{2}}{3 v_{1} + 2 v_{2}}$

Show Answer

Answer:

Correct Answer: D

Solution:

$Average speed= \frac{Total distance travelled}{Total time taken}$

$= \frac{x}{\frac{2 x / 5}{v_{1}} + \frac{3 x / 5}{v_{2}}} = \frac{5 v_{1} v_{2}}{3 v_{1} + 2 v_{2}}$

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Kinematics Question 348

Question: If a car covers 2/5th of the total distance with v1 speed and 3/5th distance with v2 then average speed is

Options:

Answer:

Solution:

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Question: If a car covers $2 / 5 t h$ of the total distance with $v_{1}$ speed and $3 / 5 t h$ distance with $v_{2}$ then average speed is