A car travels 80 km towards north at a speed of 40 km/hr. Then, travels 60 km towards west at a speed of 30 km/hr. Find the magnitude of its average velocity.

35 km/hr

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38 km/hr

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25 km/hr

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20 km/hr

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Solution

The correct option is C 25 km/hr
The magnitude of displacement of the particle is $\sqrt{80^{2} + 60^{2}} = 100 k m$
total time taken = $\frac{80}{40} + \frac{60}{30} = 4 h r$
Therefore, the average speed is given by $\frac{100}{4} = 25 k m / h r$

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A car travels 80 km towards north at a speed of 40 km/hr. Then, travels 60 km towards west at a speed of 30 km/hr. Find the magnitude of its average velocity.

The correct option is C 25 km/hrThe magnitude of displacement of the particle is √802+602=100 km total time taken = 8040+6030=4hr Therefore, the average speed is given by 1004=25 km/hr

The correct option is C 25 km/hr
The magnitude of displacement of the particle is $\sqrt{80^{2} + 60^{2}} = 100 k m$
total time taken = $\frac{80}{40} + \frac{60}{30} = 4 h r$
Therefore, the average speed is given by $\frac{100}{4} = 25 k m / h r$