Lesson 4 Homework
1.
A pitcher throws a fast ball with a horizontal velocity of 125 kmh
1
towards the home plate which is 18.5 m away. Neglecting air
resistance, find (i) the time taken by the ball to reach just above the
home plate, (ii) the vertical drop of the ball during this time.
2.
A spring loaded gun placed on a table 1.0 m above the ground level
projects a marble with an initial speed of 4.8 ms
1
. (i) What is the time
taken by the marble to drop to the ground? (ii) How far from the table
will the ball fall?
3.
A ball rolls with a constant velocity of 1.5 ms
1
at an angle of 45
o
relative to the xaxis in the 4
th
quadrant. Taking the ball to be at the
origin at t = 0, what is its position ( x and y coordinates) at t = 1.65 s?
What is the displacement of the ball at this time?
4.
The y component of a velocity that has an angle of 27
o
with the xaxis
has a magnitude of 3.8 ms
1
, (a) What is the magnitude of the
velocity? (b) What is the magnitude of the xcomponent of the
velocity?
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 Fall '10
 George
 Physics, Resistance, Work, Velocity, ball

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