In an ice hockey game a player with red T-shirt hits another player with green T-shirt. After the collision the green T-shirt player who was

Question

In an ice hockey game a player with red T-shirt hits another player with green T-shirt. After the collision the green T-shirt player who was initially at rest moves with 2 m/s velocity. Masses of red and green T-shirt players are 40kg and 60kg respectively. Find the initial speed of the red T-shirt player?

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Diễm Thu 6 months 2021-07-20T12:18:26+00:00 1 Answers 6 views 0

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    2021-07-20T12:20:02+00:00

    Answer:

    Explanation:

    The collision is elastic as no frictional force exists .

    Both momentum and energy will be conserved.

    We shall apply velocity formula applicable in respect of elastic collision

    m₁ and m₂ be mass of red and green T shirt player , u₁ and u₂ be their initial velocity , v₁ and v₂ be their final velocity

    v₂ = (m₂-m₁)u₂ / ( m₁+m₂) + 2 m₁u₁ / ( m₁+m₂)

    Given m₁ = 40 kg , m₂ = 60 kg , v₂ = 2 m /s , u₁ = ? , u₂ = 0

    Put the values in the equation

    2 = 0 + 2 x 40 x u₁ / ( 40 + 60 )

    u₁ = 2.5 m /s .

    Initial speed of red T- shirt .

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