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3 years ago

Physics !!!!!!!!!!!!!!

Physics

1 answer:

julsineya [31]3 years ago

4 0

Answer:

1) v = 0.49 m/s

2) v = 2.5 Km/h

Explanation:

1) Given,

Let the initial velocity of the dog and canoe be zero, hence the total momentum is also equal to zero.

The final velocity of the dog, v = 1.4 m/s

The mass of the dog, m = 16 Kg

The mass of the canoe, M = 45 Kg

The final velocity of the canoe, V = ?

According to the law of conservation of linear momentum,

MV + mv = 0

Substituting the given values in the above equation

45 x V + 16 x 1.4 = 0

V = -22.4 / 45

V = -0.49 m/s

The negative sign indicates that the canoe moves in the direction opposite to that of dog

Hence the velocity of the canoe, V = 0.49 m/s

2) Given,

Let the mass of the person be 'm'

The mass of his buddy is also 'm'

The initial velocity of the person, u = 5 Km/h

The initial velocity of his buddy, U = 0

According to the laws of conservation of linear momentum,

Since the person holds onto the buddy, their final velocity is combined. Let it be 'v'

mu + mU = mv + mv

mu = 2mv

v = u/2

= 5 /2

= 2.5 Km/h

Hence, the combined velocity is, v = 2.5 Km/h

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