Physics, asked by hamzakhansp67, 8 months ago

a train starts from restwith an acceleration of 0.5ms .find its speed in kmh , when it has moved through 100m

Answers

Answered by yashu200830
0

Explanation:

Given Data

Velocity = v = 36kmh-1  

            v = 36 × 1000/3600

            v = 10ms-1

Time = t = 10 s

To find

Distance = s = ?

Formula

            velocity = distance/time

            v = S/t

            S = v × t

Calculation

                   

As

       S = v × t

By putting the values

       

      S = 10 × 10 = 100 m

      S = 100m

Hence total distance will be 100m

2. A train starts from rest. It movies through 1 km in 100 s with uniform acceleration. What will be its speed at the end of 100 s.

Given Data

 Initial velocity = vi = 0 ms-1

 Distance           = S = 1km = 1000m

 Time                  = t =100 s

To find

Final Velocity   = vf =?

Formula

                                       S = vit+1/2 at2

                                       vf = vi + at

             

Calculation

First of all we have to find “a” after getting the     value of “a” we have to find “vf”.

                                                     S = vit+1/2 at2

By putting the values we get,

                                                     1000 = (0) × 100 + 1/2 × (a) × (100)2

Opening the square of 100.

                                                    1000 =  1/2 × (a) × (10000)

By dividing 2.

                                                    1000 =   (a) × (5000)

By Dividing 5000 both sides

                                                         

                                                        1000/5000 =   a

                                                                                a = 0.2 ms-2

Now we have to calculate the value of “Final Velocity” like as,

                                  vf = vi + at

Putting the values we, get

                                 vf = 0 + (0.2)×100

Multiplying 0.2 by 100

                            vf = 20 ms-1

Hence the body having the final velocity of

vf = 20 ms-1

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