Question

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Answer 1

Answer:625

Explanation:

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Answer 2

Answer:

625 METER

Explanation:

GIVEN :

Speed of train , u = 90 × 5/18 km/h = 25 m/s

Acceleration , a = -0.5 m/s²

METHOD 1 :

∴ By first formula of motion

∵ v = u + at

∵ Train will be rest

∴ Final velocity, v = 0

∴ 0 = 25 - 0.5t

∴ 25 = 0.5t

∴ t = 50 sec

⇒ ∴ By second formula of motion

   ∵ S = ut + 1/2 at²

    ∴ S = 25 × 50 - 1/2 × 0.5 × 50²

          = 1250 - 1/2 × 0.5 × 2500

          = 1250 - 625

          = 625 m

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⇒ METHOD 2 :

⇒∴ By third equation of motion

  ∴ v² = u² + 2as

  ∴ 2(0)= (25)2 + 2 ( - 0.5) s

  ∴ S = 625 m

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