Free-fall Practice Problems:

ext to the school building when he grabs his roof. (He's really sweet on her and this is how he th an initial upward velocity of 16.5 mfs. The he purse in ight? [245 s] ua student is standing n girlfriend's purse and throws it up onto the . shows his affection!) He throws the purse W1 12)A mischievous Pad roof is I 1.0 m high. How long was t 13)The acceleration due the gravity on the Moon is l/ a baseball on Earth to reach a maximum height of 20 on the Moon? [120 m] If you caught it when it came elapse between your throw and catch? [12.1 s] at, how high could you throw a baseball back down, how much time would Challenge Problems: One second later she tosses up another 14) A girl, standing still, tosses a ball vertically upwards. the second ball is tossed. With what ball at the same velocity. The halls collide 0.5 s after velocity were they tossed? [9.8 m/s] f of a building. On the way down it passes a 2 m high 15) A brick is drOpped 'orn the rec window and is observed to pass from the top to the bottom of the window in 0.25 s. (a) How fast was it moving when it passed the top of the window? [6.8 mls] (b) How far below the roof ofthe building is the top of the window? [2.3 m] 16) A rocket is launched vertically. 1t burns its fuel in 4.5 s. and while it is burning fuel it accelerates upward at a rate of 15.5 m/s2. What maximum height off the ground does the rocket reach? [405.1 m] What is its total ight time? [20.7 s] wn upward with a velocity of 9 mls upward from the top of a high cliff. At d ball is dropped from the same spot. The red ball is observed to hit the eeond before the blue ball. How high is the cliff? [128.7 m] 17) A blue ball is thro the same time, a re ground below exactly one s 18) A ball is dropped off a high cliff, and 2 5 later another ball is thrown vertically downward with an initial speed of30 m/s. How long will it take the second ball to overtake the first? [1.88 s]