Physics, asked by swarishreddy01, 1 month ago

an object starting from rest travels 20 metres in the first 2 seconds,and 100 metres in the next 10 seconds . what will be the velocity after 7 seconds from start.​

Answers

Answered by aditi240770
2

Given :-

An  object starting from rest travels 20 metres in the first 2 seconds,and 100 metres in the next 10 seconds .

To Find :-

Velocity after 7 sec

Solution :-

We know that

s = ut + 1/2 × at²

20 = (0)(2) + 1/2 × a × (2)²

20 = 0 + 1/2 × a × 4

20 = 2a

20/2 = a

10 = a

Now

v² = u² + 2as

v² = (0)² + 2(10)(20)

v² = 0 + 20 × 20

v² = 400

v = √400

v = 20 m/s

Now

After 2 seconds

v = u

s = ut + 1/2 at²

100 = (20)(10) + 1/2 × a × (10)²

100 = 200 + 1/2 × a × 100

100 = 200 + 50a

100 - 200 = 50a

-100 = 50a

-100/50 = a

-2  = a

Now

v = u + at

v = 20 + (-2)(7)

v = 20 + (-14)

v = 20 - 14

v = 6 m/s

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