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Alex777 [14]
3 years ago
15

Help me plz.Show workings​

Physics
2 answers:
Ksenya-84 [330]3 years ago
8 0

This question is a good example of the difference between 'speed' and 'velocity'.  This one is all 'velocity', and you've absolutely gotta keep the directions straight.

The object started out moving forward at 10 m/s.  It ended up moving backward at 2 m/s.  What was the change in its velocity ?

The change was <u>12 m/s backward</u> !  

Momentum = (mass) x (velocity).

Change in momentum = (mass) x (change in velocity)

This change in momentum = (0.1 kg) x (12 m/s backward)

This change in momentum = 1.2 m/s backward  or  <em>1.2 Ns  (B)</em>

ddd [48]3 years ago
3 0
Change in momentum: finial momentum - initial momentum
Momentum = mass * velocity
Mass = 100g, same as 0.1kg
m(v-u) = 0.1(10-2) = 0.1(8)
The answer is 0.8Ns
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Explanation:

Given the data in the question;

we know that;

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v ∝ √W

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the proportionality constant depends upon the surface area and the density of the medium (like air). The coffee filters can be stacked such that the resulting area is roughly unchanged. So, the constant of proportionality k is also unchanged

v/√W = constant

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v₂ = v₁√(W₂ / W₁ )

given that;

v₁ = 0.856 m/s,

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so we substitute

v₂ = 0.856 √(14W₁  / W₁ )

v₂  = 0.856 √( 14( W₁/W₁)

v₂  = 0.856 √( 14(1)

v₂  = 0.856 √( 14 )

v₂  = 0.856 × 3.741657

v₂  = 3.2 m/s

Therefore, the terminal velocity of 14 nested coffee filters is 3.2 m/s

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