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expeople1 [14]
3 years ago
6

Swim 2km at 3km/h. Run at 12km/h for 1 ½ hours. Cycling 55km at 30 km/h. What is the mean overall speed.

Physics
1 answer:
exis [7]3 years ago
5 0

Answer:

t1 = S1 / V1 = 2 km / 3 km/hr = 2/3 hr        where S1 = 2 km

S2 = 12 km/hr * 3/2  hr = 18 km      where t2 = 3/2 hr

t3 = S3 / V3 = 55 km / 30 km/hr = 11/6 hr   where S3 = 55 km

T = t1 + t2 + t3 = 4/6 + 9/6 + 11 / 6 = 24/6 = 4 hrs

S = S1 + S2 + S3 = 2 + 18 + 55 = 75 km

V =  S / T = 75 km / 4 hrs = 18.75 km/hr     for the average speed

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Answer:

14 m/s

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u = 0, h = 10 m, g = 9.8 m/s^2

Use third equation of motion

v^2 = u^2 + 2 g h

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3 years ago
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Explanation:

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3 years ago
What is the pressure exerted when a force of 20 N is applied to an object over an area of 2 m2 ?
IgorC [24]

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8 0
3 years ago
How far does a boat travel in 5 hours at 32 miles per hour? 162 mi 160 mi 210 mi
sleet_krkn [62]
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4 0
3 years ago
Read 2 more answers
A ski jumper travels down a slope and
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Answer:

304.86 metres

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The x and y cordinates are dcos\theta and dsin\theta respectively

The horizontal distance travelled, x=v_{ox}t=dcos\theta

Making t the subject, t=\frac{dcos\theta}{v_{ox}}

Since y=0.5gt^2=dsin\theta, we substitute t with the above and obtain

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3 years ago
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