Biology Forums - Study Force

A projectile is thrown from the top of a building with an initial velocity of 30 m/s in the horizontal direction. If the top of the building is 30 m above the ground, how fast will the projectile be moving just before it strikes the ground?
 a. 35 m/s
  b. 39 m/s
  c. 31 m/s
  d. 43 m/s
  e. 54 m/s

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[Ques. 2] A rock is projected from the edge of the top of a building with an initial velocity of 12.2 m/s at an angle of 53 above the horizontal. The rock strikes the ground a horizontal distance of 25 m from the base of the building. Assume that the ground is level and that the side of the building is vertical. How tall is the building?
 a. 25.3 m
  b. 29.6 m
  c. 27.4 m
  d. 23.6 m
  e. 18.9 m

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[Ques. 3] A baseball is hit at ground level. The ball is observed to reach its maximum height above ground level 3.0 s after being hit. And 2.5 s after reaching this maximum height, the ball is observed to barely clear a fence that is 97.5 m from where it was hit. How high is the fence?
 a. 8.2 m
  b. 15.8 m
  c. 13.5 m
  d. 11.0 m
  e. 4.9 m

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[Ques. 4] A ball is thrown horizontally from the top of a building 0.10 km high. The ball strikes the ground at a point 65 m horizontally away from and below the point of release. What is the speed of the ball just before it strikes the ground?
 a. 43 m/s
  b. 47 m/s
  c. 39 m/s
  d. 36 m/s
  e. 14 m/s

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[Ques. 5] The initial speed of a cannon ball is 0.20 km/s. If the ball is to strike a target that is at a horizontal distance of 3.0 km from the cannon, what is the minimum time of flight for the ball?
 a. 16 s
  b. 21 s
  c. 24 s
  d. 14 s
  e. 19 s

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[Ques. 6] Starting from one oasis, a camel walks 25 km in a direction 30 south of west and then walks 30 km toward the north to a second oasis. What is the direction from the first oasis to the second oasis?
 a. 21 N of W
  b. 39 W of N
  c. 69 N of W
  d. 51 W of N
  e. 42 W of N

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[Ques. 7] Starting from one oasis, a camel walks 25 km in a direction 30 south of west and then walks 30 km toward the north to a second oasis. What distance separates the two oases?
 a. 15 km
  b. 48 km
  c. 28 km
  d. 53 km
  e. 55 km

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[Ques. 8] A car originally traveling at 30 m/s manages to brake for 5.0 seconds while traveling 125 m downhill. At that point the brakes fail. After an additional 5.0 seconds it travels an additional 150 m down the hill. What was the acceleration of the car after the brakes failed?

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[Ques. 9] Starting from rest, a car travels 1350 meters in 1.00 minute. It accelerated at 1.0 m/s2 until it reached its cruising speed. Then it drove the remaining distance at constant velocity. What was its cruising speed?

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[Ques. 10] A peregrine falcon dives at a pigeon. The falcon starts with zero downward velocity and falls with the acceleration of gravity. If the pigeon is 76.0 m below the initial height of the falcon, how long does it take the falcon to intercept the pigeon?

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