PHYSICS
Kinematics 14
Projectiles in 2 Dimensions
1) A marble traveling at 1 m/s rolls off the edge of a level table. If it hits the floor 0.30 m
away from the base of the table, how high is the table?
2) A ball is thrown at a speed of 40 m/s at an angle of 50 degrees above the horizontal on
level ground.
a. How long will the ball be in the air?
b. What will the horizontal velocity be?
c. What will the total speed of the ball be at impact?
(a2 + b2 = c2 )
3) A ball is projected from the ground at an angle of 30 degrees above the horizontal at a
speed of 128 ft/sec. Ignoring air friction, calculate:
a. how long it will be in the air
b. how high it will rise
c. what its horizontal range will be.
4) An object is projected downward at an angle of
30 degrees below the horizontal from the top of a
building 170 m high. Its initial speed is 40 m/s.
Calculate:
a. the final velocity in the vertical direction,
b. time it takes to hit the ground,
c. horizontal displacement.
5) A rock is thrown off a bridge 250 ft high. The
rock is thrown with a velocity of 10 ft/s at an
angle of 53 degrees above the horizontal.
Calculate:
a. the final velocity in the vertical direction,
b. time it takes to hit the ground.
c. horizontal displacement.
1) 0.441 m high
2) 6.24 sec
160 m
40 m/s
3) 4 sec
64 ft
443 ft
4) -61.6 m/s
4.2 sec
145.5 m
5) -126.7 ft/s
4.2 sec
25.2 m