Question

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Answer 1

Answer:

answer

Explanation:

option b is the correct answer

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Answer 2

Given

✭ Initial Velocity (u) = 72 km/h

✭ Final Velocity (v) = 18 km/h

✭ Distance (s) = 20 m

\displaystyle\large\underline{\sf\blue{To \ Find}}

To Find

◈ The Deceleration of the car?

\displaystyle\large\underline{\sf\gray{Solution}}

Solution

So here Deceleration means negative Acceleration that is the acceleration is in the opposite direction to the motion and so that it's Speed reduces

━━━━━━━━━

\underline{\bigstar\:\textsf{According to the given Question :}}

★According to the given Question :

So here we shall use the third Equation of motion, that is,

\displaystyle\sf \underline{\boxed{\sf v^2-u^2 = 2as}}

v

2

−u

2

=2as

v = 18 km/h

u = 72 km/h

s = 20 m

So we see that the speeds are in km/h so on converting them,

➝ \displaystyle\sf v = 18\times \dfrac{5}{18}v=18×

18

5

➝ \displaystyle\sf \purple{Final \ Velocity = 5 \ m/s}Final Velocity=5 m/s

»» \displaystyle\sf u = 72\times \dfrac{5}{18}u=72×

18

5

➝ \displaystyle\sf \orange{Initial \ Velocity = 20 \ m/s}Initial Velocity=20 m/s

Now the Deceleration will be,

➳ \displaystyle\sf v^2-u^2 = 2asv

2

−u

2

=2as

➳ \displaystyle\sf 5^2-20^2 = 2\times a\times 205

2

−20

2

=2×a×20

➳ \displaystyle\sf 25-400 = 40a25−400=40a

➳ \displaystyle\sf -375 = 40a−375=40a

➳ \displaystyle\sf \dfrac{-375}{40} = a

40

−375

=a

➳ \displaystyle\sf \pink{Deceleration = 9.375 \ m/s^2}Deceleration=9.375 m/s

2

\displaystyle\sf \underline{\therefore Answer \ is \ Option \ A}

∴Answer is Option A

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