phys hw 9_23 - Science with Katie Dutton

Name: ________________________________
Horizontal Projectile Motion Worksheet 2
1.
A stone is thrown horizontally from a cliff 30m high with an initial speed of 20m/s.
A) How far from the cliff does the stone strike the ground?
B) What is the velocity (speed and direction) of the stone as it hits the ground?
2.
A ball rolls off the edge of a table 1.44m above the floor and strikes the floor at a point 2m horizontally from the edge
of the table.
A) What is the time the ball was in the air?
B) What is the initial velocity of the ball?
C) What is the velocity of the ball as it hits the floor?
3.
A bomber is flying at a height of 9 km at 800 km/h. How far in front of the target should he drop his bombs?
Phys 9/2014
4.
A ball is kicked horizontally at 8.0 m/s from a cliff 80 m high. How far from the base of the cliff will the stone strike the
ground?
5.
An egg is thrown horizontally at 6.5 m/s off the roof of a building that is 60 m tall.
A) How long does it take to hit the ground?
B) The egg thrower was aiming at a person standing 4.3 m from the base of the building. Does the egg hit its target?
(Prove this with math!)
C) What is the velocity (speed and direction) of the egg as it hits the ground?
6.
A bullet is fired 1000 m/s horizontally from a gun that is 1.8 m above the ground. At the same time a similar bullet is
dropped from the same height. The fired bullet will:
A) hit the ground first
C) hit the ground at the same time as the dropped bullet
B) hit the ground second
D) never hit the ground
Ans: 1.A) 49.4m, B) 31.4m/s[50.4º below horizon], 2.A) 0.542 sec, B) 3.69 m/s [horizontal], C) 6.47m/s[55.2º below horizontal], 3. 9532
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m, 4. 32.3 m, 5.A) 3.50 s, B) Maybe?  C) 34.9 m/s at 79.3 below horizontal, 6. C (why?)