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azamat
3 years ago
5

(b) The speed of the vehicle is written as 90 km/h. State the speed in SI unit. Show your working in the space below.

Physics
2 answers:
suter [353]3 years ago
6 0

Answer:

Explanation:I don't say you to mark my ans as brainliest but if it has really helped you plz don't forget to thank me...

cestrela7 [59]3 years ago
5 0

Answer:

90 km/h = 25 m/ s

Explanation:

to understand

1 km = 1000 m

1 h = 60 minutes and since 1 minute = 60 s you can see that 1 h = 60 * 60 s

90 km / h = 90 1000m / 3600 s

90 *1 / 3.6

90/ 3.6

25 m/ s

so 90 km/h = 25 m/ s

(by the way 90 m/s = 3.6 * 90 = 324 km/ h )

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Answer:

The impulse exerted by one cart on the other has a magnitude of 4 N.s.

Explanation:

Given;

mass of the first cart, m₁ = 2 kg

initial speed of the first car, u₁ = 3 m/s

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initial speed of the second cart, u₂ = 0

Let the final speed of both carts = v, since they stick together after collision.

Apply the principle of conservation of momentum to determine v

m₁u₁ + m₂u₂ = v(m₁ + m₂)

2 x 3 + 0 = v(2 + 4)

6 = 6v

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Impulse is given by;

I = ft = mΔv = m(

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I = 2 (3 -1 )

I = 4 N.s

The impulse exerted by the second cart on the first cart is given;

I = 4(0-1)

I = - 4 N.s (equal in magnitude but opposite in direction to the impulse exerted by the first).

Therefore, the impulse exerted by one cart on the other has a magnitude of 4 N.s.

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3 years ago
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Explanation:

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