Physics, asked by sanjay3866, 22 days ago

On a 100 km track, a car travels the first 50 km with a uniform speed of 40 km/hr. How fast must the car travel the next 50 km so as to average 60 km/hr for the entire trip? (Answer should be in km/hr)​

Answers

Answered by xqco22f98
1

Explanation:

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Answered by PoojaBurra
0

Given: On a 100 km track, a car travels the first 50 km with a uniform speed of 40 km/hr.

To find: Speed with which the car travels the next 50 km so as to average 60 km/hr for the entire trip.

Solution:

  • Average speed of the body is the total distance travelled by it divided by the total time taken.
  • Here, the total distance is 100 km.
  • The time taken to travel the first 50 km is calculated as,

        time = \frac{50km}{40km/hr}

                 = 1.25 hr

  • So, for the complete distance of 100 km, 2.5 hours are taken.
  • Average speed is given by the formula,

        (speed)_{av} = \frac{100}{2.5}

                        =40km/hr

  • To find how fast must the car travel the next 50 km, the following formula is used,

        \frac{40km/hr +x}{2} = 60km/hr

  • Here, x is the speed at which the car must travel for the next 50 km.

        x = 40km/hr

Therefore, the speed with which the car travels the next 50 km so as to average 60 km/hr for the entire trip is 40 km/hr.

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