Question

A car moves at constant 60km for 1km and 40km/hr next 1km what is the average speed of car

Answer 1

Answer on Question #44266, Physics, Mechanics | Kinematics | Dynamics

A car moves at constant 60km for 1km and 40km/hr next 1km what is the average speed of car

Solution:

Average speed is equal to $v = \frac{S}{t}$, where $S$ is total distance and $t$ is total time of motion.

The total time is equal to sum of two times (first when car is moving with speed $60\frac{km}{h}$ and second when the car is moving with speed $40\frac{km}{h}$). Thus, $t = t_1 + t_2 = \left( \frac{1}{60} + \frac{1}{40} \right)h$.

Total distance is $S = 1 \text{ km} + 1 \text{ km} = 2 \text{ km}$.

Then average speed $S/t$ is $47.6\frac{km}{h}$

Answer: $47.6\frac{km}{h}$

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