Question

A man go one place in the speed of 4 km/ hr coming on speed of 16km/ he. What is the average speed on this journey

Answer 1

The value of average speed is 6.4 Km/hr .

Step-by-step explanation:

Average speed = 2 x product/sum

= 2 x 4 x 16/(4 + 16)

= 128/20

= 6.4 km/hr

Thus the value of average speed is 6.4 Km/hr .

• The average speed is always less than the average of the two speeds, 4 & 16.
• The reason is that more time is spent at the lower speed.

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A car whose acceleration is constant reaches a speed of  80 km/h in 20 s starting from rest. How much more time  is required for it to reach a speed of 130 km/h?

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