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Sedbober [7]
3 years ago
8

A dummy is fired vertically upward from a canon with a speed of 40 m/s. How long is the dummy in the air? What is the dummies ma

ximum height?
Physics
2 answers:
nlexa [21]3 years ago
6 0

Answer:

8,1549 seconds

81,5494 meters is the maximum height

Explanation:

REmemeber that in physiscs the formula for maximum height is given by the next representation:

H=\frac{Vo^2}{g}

Sow we just have to insert the values into the formula:

H=\frac{Vo^2}{2g}\\H=\frac{40^2}{2*9,8}\\h=\frac{1600}{19,62}\\h=81.5494meters

Now the time that it takes the dumy to fall from that height is given by thenext formula, and then we just multiply that by 2 to calculate the time that the dummy was in the air:

t=\sqrt{\frac{2d}{g} } \\

Now we insert the data we have into the formula:

t=\sqrt{\frac{2d}{g} } \\ t=\sqrt{\frac{2(81,5494)}{9,8} }\\t=\sqrt{\frac{16309}{9,81} } \\\\t=4,077s

in free fall the amount of time it takes an object going up is the same amount of time it take to fall, so we just multiply the time falling by 2 and we get taht the dummy was in the air for 8.1549 seconds.

Ket [755]3 years ago
5 0

KINEMATICS

Uniform or constant motion in a straight line (rectilinear). Speed or velocity constant and/or acceleration constant. If motion is up and down and/or has an up and down component then acceleration omn earth will be g. g is about 10m/s/s.


speed = distance/time

velocity = displacement/time

s=distance ... u=initial speed ... v = final speed ... a = acceleration ... t = time


v=u+at

v^2=u^2+2as

s=ut+1/2at^2

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