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3 years ago

If Bert the Bat travels East at 200 meters in 10 seconds, what is his velocity?

Physics

1 answer:

dexar [7]3 years ago

4 0

Answer:

20m/s due east

Explanation:

Given parameters:

Displacement eastward = 200m

Time = 10s

Unknown:

Velocity = ?

Solution:

Velocity is the displacement divided by time;

Velocity = $\frac{displacement}{time}$

Velocity = $\frac{200}{10}$ = 20m/s due east

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Colt1911 [192]

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Explanation:

The motion of a car slowed down by friction is a uniformly accelerated motion, so we can use the following suvat equation:

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where:

$\mu=0.80$ is the coefficient of friction

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Substituting and solving for s, we find:

$s=\frac{v^2-u^2}{-2\mu g}=\frac{0-(28.7)^2}{-2(0.80)(9.8)}=52.5 m$

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$s=52.5 m$

We can use again the same suvat equation:

$v^2-u^2=2as$

And since the final velocity is zero

u = 0

We can find the initial velocity of the car:

$v=\sqrt{2as}=\sqrt{2\mu gs}=\sqrt{2(0.25)(9.8)(52.5)}=16.0 m/s$

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