Projectile Practice: Angles and mid-point
Name ANSWER KEY
Date 29
Period 3,6,7
1. Dare Devil Dave is attempting to jump 30 school buses (each 1.2 m wide) on his motor cycle.
What must his total initial velocity be in order to accomplish this? (Assume he is in the air for 4.2
seconds)
2. A soccer ball is kicked across a field and lands 37m away. Assuming it took 2.1 s for the ball to
land, how fast (and it what direction) was the ball kicked?
3. A trebuchet in a pumpkin chunking contest needs to throw a pumpkin 220 m to hit the target. The
pumpkin is in the air for 5.1 s.
a) What was the launching speed for the pumpkin?
b) How high does the pumpkin go?
4. A golfer hits a golf ball with an initial velocity of 17 m/s at an angle of 32o. (14.4 m/s forward, 9
m/s upward) Determine
a) how long the ball is in the air
b) how far the ball travels.
c) the maximum height the ball reaches.
5. Using a large slingshot, George is launched at a 40o angle with an initial speed of 7 m/s. (5.4 m/s
forward, 4.5 m/s upward)
a) Where in his trajectory is the speed the smallest?
b) Where in his trajectory is the speed the largest?
c) When is his speed the smallest?
d) When is his horizontal speed the smallest?
e) What happens to his acceleration during his flight?
6. A firehose ejects a stream of water at 25 m/s at an angle of 350 above the horizontal (20. 5 m/s
forward, 14.3 m/s upward). Assuming that the water strikes the building at the highest possible
spot, determine
a) How long it takes the water to reach the building?
b) How far from the building the fire hose is located?
Solutions:
1. 22.3 m/s at 670
2. 20.4 m/s at 30.30
3. 49.8 m/s at 30.10 b) 31.8 m
4. a) 1.83 s b) 26.5 m c)4.14 m
5. Check your answers with me!!
6. a) 1.46 s b) 29.2 m