A pole-vaulter clears a crossbar and takes 1.0 s to fall from the apex of his fl

Question

A pole-vaulter clears a crossbar and takes 1.0 s to fall from the apex of his flight to the landing pit. What was his downward vertical velocity at the end of this second? 4.9 m/s 9.81 m/s 1.0 m/s 19.62 m/s If a body has an initial velocity of -20 m/s and it experiences an acceleration of -9.8 m/s2 for 2 s, which of the following statements is true? The magnitude of the velocity will increase. The direction of motion will be reversed. The displacement will be positive. The body will have a final velocity of 20 m/s. All of the above are true. A-Rod hits a baseball with a speed of 35 m/s at an angle of 55 degrees from the horizontal. Assuming that the ball is caught by a fielder at the same height that it left the bat, how far did the ball travel? Answer = m (so you don't have to include units in your answer - also, round to closest meter) When a baseball player swings at a ball, the angular velocity of the bat is zero at the start of the swing and 30 rad/s at ball contact. If the swing lasts 0.30 s, what is the average angular acceleration of the club during the swing? 10 rad/s2 30 rad/s2 60 rad/s2 100 rad/s2

Explanation / Answer

1)gt=9.81 m/s

2)the magnitude of velocity will increase

3)S=u^2sin2theta/g

=115.11 m

=115 m

4)30/0.3

=100 rad/s^2

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