Physics, asked by gokujane, 1 year ago

A car moves a distance of 200 m. It covers the first half of the distance at a speed of 40 km/h and the second half of distance at speed ‘v’. Calculate the average speed of bus?

Answers

Answered by uneq95

You first need to know what average speed is actually.

Avg Speed = Total distance travelled/ total time

According to the question, the car travels first 100m at a speed of 40km/h. Now here you need to take care of the units too.
Using this, we can calculate the time spent by the car in travelling the first 100 m.
i.e. t1= distance/ speed
t1= 0.1km/40km/h = 0.0025hrs

similarly, the car travels the next 100m at a speed of v km/ h.
t2= 0.1/v

Now we can calculate the average speed of the car.
Avg speed = (0.1+0.1)/(0.0025+0.1/v)

= 0.2/(0.0025+0.1v)
= 2/(0.025+v) km/ hr

This is the required answer, as per the given quantities. Once you have the value of v, you can substitute it her and get the final answer.

uneq95: that is not mentioned in the question. i have solved with what was provided in the question.

uneq95: either the answer is in terms of v or your question is wrong or incomplete.

gokujane: ok thanks

gokujane: when is a null or empty statement required in c++ can u help me with this too

uneq95: pls click the heart button

uneq95: empty statement doesnt do anything

uneq95: you just put a semicolon after a code line

uneq95: it is used sometimes in loops when we dont increment or decrement the variable and the modification is done in the loop body

uneq95: for(int i=0; i<7; ;){ loop body}

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