1. a partially filled balloon that has helium in it is released off the top of a 400m building. because of the helium, the acceleration due to gravity is decreased to 2.5 m/s2. how long does it take for the balloon to reach the ground ?
2. a rubber ball travelling at 10 m/s for 4 seconds at 450 north of east collides with a wall. the ball reflects off the wall at the same speed and continues to move for 3 seconds. what is the displacement of the ball?

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During spring semester at mit, residents of the parallel buildings of the east campus dorms battle one another with large catapults that are made with surgical hose mounted on a window frame. a balloon filled with dyed water is placed in a pouch attached to the hose, which is then stretched through the width of the room. assume that the stretching of the hose obeys hooke's law with a spring constant of 89.0 n/m. if the hose is stretched by 5.80 m and then released, how much work does the force from the hose do on the balloon in the pouch by the time the hose reaches its relaxed length? unitst 3 number-1497 the tolerance is +/-5% open show work click if you would like to show work for this question:

Two balls, each with a mass of 0.5 kg, collide on a pool table. is the law of conservation of momentum satisfied in the collision? explain why or why not