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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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A ball is thrown horizontally from the top of a building 0.10 km high. The ball strikes the ground at a point 65 m horizontally
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Answer:

option B

Explanation:

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4. The Coyote has an initial position vector of \vec r_0=(15.5\,\mathrm m)\,\vec\jmath.

4a. The Coyote has an initial velocity vector of \vec v_0=\left(3.5\,\frac{\mathrm m}{\mathrm s}\right)\,\vec\imath. His position at time t is given by the vector

\vec r=\vec r_0+\vec v_0t+\dfrac12\vec at^2

where \vec a is the Coyote's acceleration vector at time t. He experiences acceleration only in the downward direction because of gravity, and in particular \vec a=-g\,\vec\jmath where g=9.80\,\frac{\mathrm m}{\mathrm s^2}. Splitting up the position vector into components, we have \vec r=r_x\,\vec\imath+r_y\,\vec\jmath with

r_x=\left(3.5\,\dfrac{\mathrm m}{\mathrm s}\right)t

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5. The shell has initial position vector \vec r_0=(1.52\,\mathrm m)\,\vec\jmath, and we're told that after some time the bullet (now separated from the shell) has a position of \vec r=(3500\,\mathrm m)\,\vec\imath.

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r_x=v_0t

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3500\,\mathrm m=v_0(0.56\,\mathrm s)\implies v_0=6300\,\dfrac{\mathrm m}{\mathrm s}

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3 years ago
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