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Ludmilka [50]
3 years ago
7

Three elephants are standing on a very very strong bridge.the bridge happens to have marks at every meter along the way(almost l

ike it was meant for setting up a physics problem).elephant#1 is standing at 4 meters and starts walking.he walks for 30 seconds,the elephant is at the place on the bridge marked 64 meters.what is elephant#1's speed?l
Physics
1 answer:
sasho [114]3 years ago
3 0

Speed = (distance covered) / (time to cover the distance) .

Distance covered = (mark at the end) minus (mark at the beginning)

                             =   (64m - 4m) = 60 meters .

Speed = (60 meters) / (30 seconds)  =  2 meters/second .

We don't care about the bridge or the other two elephants.
They don't have any effect on the question or the answer.
 
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Baseball player swings and hits a pop fly straight up in the air to the catcher. the height of the baseball in meters t seconds
andre [41]
The height at time t is given by
h(t) = -4.91t² + 34.3t + 1

When the ball reaches maximum height, its derivative, h'(t) = 0.
That is,
-2(4.91)t+34.3 = 0
-9.82t + 34.3 = 0
t = 3.4929 s

Note that h''(t) = -9.82 (negative) which confirms that h will be maximum.

The maximum height is
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Answer:
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4 0
3 years ago
A cat leaps into the air to catch a bird with an initial speed of 2.74 m/s at an angle of 60.0° above the ground. What is the hi
Volgvan

Answer: D. 0.29 m

Explanation:

We will use the following equations to describe the leap of the cat:

y=V_{o}sin\theta t-\frac{gt^{2}}{2}   (1)

V_{y}=V_{oy}-gt   (2)

Where:

y  is the height of the cat  

V_{oy}=V_{o}sin\theta is the cat's initial velocity

\theta=60\°

g=9.8m/s^{2}  is the acceleration due gravity

t is the time

V_{y} is the y-component of the velocity

Now the cat will have its maximum height y_{max} when V_{y}=0. So equation (2) is rewritten as:

0=V_{oy}-gt   (3)

Finding t:

t=\frac{V_{oy}}{g}=\frac{V_{o}sin\theta}{g}   (4)

t=\frac{2.74 m/s sin(60\°)}{9.8m/s^{2}}   (5)

t=0.24 s   (6)

Substituting (6) in (1):

y_{max}=(2.74 m/s)sin(60\°) (0.24 s)-\frac{(9.8m/s^{2})(0.24 s)^{2}}{2}   (7)

Finally:

y_{max}=0.287 m \approx 0.29 m   (8)

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