Unit 2c Projectile Motion Physics Worksheet Page 26
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2926. A baseball thrown vertically up is aloft 4.8 seconds before returning to earth. What
was its initial velocity in ft/sec?
27. A raindrop, mysteriously falling on the moon, hits at 57.4 m/sec. The moon’s gravity
2
is 1.6 m/sec
, so how long was the drop falling?
28. If a rock is thrown vertically up at 17.3 m/sec, how long will it take before it is falling
at –8.8 m/sec?
*Now for some good stuff.
29. A Brazilian aborigine fires a dart from his blowgun at 41 m/sec, aimed 32 above the
horizontal.
a) What is its initial vertical velocity?
b) How long does it take to return to earth?
30. Jimmy Jones steps up to bat for a whopper of a hit. The baseball leaves the bat at 76
m/sec, 57 above the horizontal. How long is it in the air?
31. A rock is thrown at 15.2 ft/sec, 41 above the horizontal. How long will it be in the
air?
32. A Roman centurian fires off a vat of burning pitch from his catapult at 18.2 m/sec,
37 above the horizontal.
a) How long is it in the air?
b) What is the horizontal component of velocity?
c) How fat does it get before landing?
33. A bullet is fired at 677 m/sec, 35 above the horizontal. How far does it get before
landing? (we neglect air resistance, of course)
34. A baseball, thrown at 21.7 m/sec 28 above the horizontal will travel how far before
hitting the ground?
35. A rock is thrown so that it is in the air 4.3 seconds and lands 36 m from its starting
point. What was the initial vertical and horizontal speed?
36. A slingshot fires a pebble which is in the air for 5.3 seconds and lands 73 m from
where it took off. What were the initial vertical and horizontal components of velocity?
*Look over what we are doing in these problems.
First, we consider each as two separate problems: a vertical one and a horizontal
one. In case of projectile motion, the vertical velocity is the thing that gets the ball into
the air. The greater the vertical velocity, the longer the ball will stay aloft.
26
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