A cannonball is fired horizontally at 20
m/s from a cliff. Its speed 2 seconds after being fired is about
_________ m/s
Homework Answers
The vertical component of the velocity increases in the downward
direction.
According the following formula Vf=Vi+g*t , After 2s, the vertical
component of the velocity will be 9.8×2=19.6 m/s.
The horizontal component of the velocity remains unchanged
20m/s.
The velocity can be calculated by the formula V = √(Vx^2+Vy^2) ,
where Vx – the horizontal component of the velocity and Vy – the
vertical component of the velocity.
Finally, V=√{(V_x)^2+(V_y)2}
V=√[400+384.16]
V= 28 m/s
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