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letdou2670
05.10.2019 •
Physics
Aball of mass m is thrown into the air in a 45° direction of the horizon, after 3 seconds the ball is seen in a direction 30° from the horizon. ignoring the friction of the air, find the initial velocity v of the ball.
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Ответ:
Velocity (magnitude) is 98.37 m/s
Explanation:
We use the vertical component of the initial velocity, which is:
Using kinematics expression of vertical velocity (in y direction) for an accelerated motion (constant acceleration, which is gravity):
Now we need to find
as a function of
. We use the horizontal velocity, which is always the same as follow:
We know the angle at 3 seconds:
Substitute
in
and then solve for ![v_y](/tpl/images/0288/4442/46b28.png)
With this expression we go back to the kinematic equation and solve it for initial speed
Ответ:
The air condenses as it moves to the leeward side.