Question

the speed of a body increases from 20 kmh-1 to 50 km-1 find the increase in speed​

Answer 1

Answer:

increase in speed = final speed - initial speed

= 50-20 = 30 km per hour

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Answer 2

Increase in Speed is (Final - Initial) Speed

Explanation:

Initial Speed of Body, u = $20\ kmhr^-^1$

Final Speed of Body,v = $50\ kmhr^-^1$

So,

Increase in Speed = Final Speed - Initial Speed

                              = $(50 - 20)\ kmhr^-^1$

                              = $30\ kmhr^-^1$

now, Increase in speed in \frac {meter}{second} = $30 \times \frac {5}{18}$

                                                                               = $\frac {150}{18}$

                                                                               = 8.33 $ms^-^1$