physics

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A baseball is thrown at an angle of 23◦ relative
to the ground at a speed of 22.3 m/s. The ball
is caught 36.4649 m from the thrower.
The acceleration due to gravity is
9.81 m/s2 .
How long is it in the air?

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    To model a spacecraft, a toy rocket engine is securely
    fastened to a large puck, which can glide with negligible
    friction over a horizontal surface, taken as the xy plane.
    The 4.00-kg puck has a velocity of 300
    ˆ
    i m/s at one instant.
    Eight seconds later, its velocity is to be (800
    ˆ
    i $ 10.0
    Assuming the rocket engine exerts a constant horizontal
    force, find (a) the components of the force and (b) its
    magnitude.

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