Unit 2c Projectile Motion Physics Worksheet Page 24
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297. How long does it take a needle to drop 2.6 cm?
There is no #8!!!!
*As we saw in the previous chapter, when two dimensions are involved we may treat
each dimension individually and independently. Thus a falling object will accelerate at –
2
9.8 m/sec
whether it is released from rest or thrown horizontally. In both cases the initial
vertical velocity is zero, so at each moment after release, they will have fallen an
identical vertical distance.
9. A rock is thrown horizontally at 18 m/sec. Where is it 1.5 seconds later?
10. A rock is thrown horizontally at 5.7 m/sec. Find its velocity and the direction of its
motion 3.6 seconds after release.
11. A can of Skoal is kicked horizontally at 4.6 m/sec off a cliff 12.4 m high.
a) How long will it take to land?
b) How far from the cliff will it land?
12. A man fired a bullet horizontally from 1.8 m above the ground. If the bullet’s speed is
415 m/sec, how far away will it land?
13. A marble, rolling off the edge of a table is observed to hit the floor 0.77 m from the
table. If the table top is 0.86 m high, how fast was the marble traveling when it left the
table?
42m
14. A colony of troglodytes has been in
a lengthy feud with its neighbors on the
adjacent cliff. Colony A finally develops
Colony A
Colony B
an important military breakthrough; it
2
rolls bombs off its cliff at know rates of
speed, thus gaining pinpoint accuracy in
its attacks. If the cliffs are separated by
42 m and a bomb is rolled at 6.0 m/sec, how far down the cliff will it land?
42 m
15. The troglodyte war continues and
a particularly offensive member of
colony B is located 110 m below the top.
110 m
At what speed must a bomb be rolled to get him?
6. Freddy Frog returns for another diving competition.
This time from the 13 m board, he takes off at 6.5 m/sec.
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