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3 years ago

Find your average speed if you run 50m in 10s

Physics

2 answers:

attashe74 [19]3 years ago

8 0

Average speed = (distance covered) / (time to cover the distance)

Average speed = (50 m) / (10 s)

Average speed = 50/10 m/s

Average speed = 5 m/s

Anastasy [175]3 years ago

6 0

50m divided by 10s equals 5m/s.
You're welcome.

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At one instant of time, a car and a truck are traveling side by side in adjacent lanes of a highway. The car has a greater veloc

Helen [10]

Answer:

Explanation:

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3 years ago

Kieran takes off from rest down a 50 m high, 10° slope on his jet-powered skis. The skis have a thrust of 280 N parallel to the

xz_007 [3.2K]

Answer:0.46

Explanation:

Given

Initial height $h=50 m$

inclination $\theta =10^{\circ}$

Thrust $=280 N$

combined mass of kieran and skis $m=50 kg$

Speed at the bottom $v=40 m/s$

From Work Energy Theorem

Work done by all the force is equal to change in kinetic Energy

$W_{gravity}+W_{friction}+W_{thrust}=\frac{1}{2}mv^2-0$ ------------1

distance traveled along the slope $x=\frac{50}{\sin 10}=287.93 m$

$W_{gravity}=mgh=50\times 9.8\times 50=24500 J$

$W_{thrust}=F\times x=280\times 287.93=80,620.4 J$

$W_{friction}=-\mu mg\cos 10$

substitute in 1

$24,500+80,620.4+W_{friction}=\frac{1}{2}\times 50\times 1600$

$W_{friction}=40,000-24,500-80,620.4$

$-\mu \cdot 50\times 9.8\times 287.93=-65,120.4$

$\mu =\frac{65,120.4}{141,085.7}=0.46$

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3 years ago

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Explanation:

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2 years ago

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