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Bezzdna [24]
3 years ago
5

Please helpppp meeeee

Physics
1 answer:
Xelga [282]3 years ago
7 0
13.6) When any boat displaces a weight of water equal to its own weight, it floats.
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Read 2 more answers
a train car of mass 444 kg moving at 5 m/s bounces into another car on the same tracks of mass 344 king. of the second car was m
Kamila [148]

Answer:

3.7 m/s

Explanation:

M = 444 kg

U = 5 m/s

m = 344 kg

u = - 5 m/s

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As the collision is elastic

By use of conservation of momentum

MU + mu = MV + mv

444 x 5 - 344 x 5 = 444 V + 344 v

500 = 444 V + 344 v

125 = 111 V + 86 v .... (1)

By using the formula of coefficient of restitution ( e = 1 for elastic collision)

e = \frac{V-v}{u-U}

-5 - 5 = V - v

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v = V + 10

Substitute the value of v in equation (1)

125 = 111 V + 86 (V + 10)

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V = - 3.7 m/s

Thus, the speed of first car after collision is 3.7 m/s. negative sign shows that the direction is reverse as before the collision.

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3 years ago
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