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travel horizontally
t matters how much mass the ball has
Aim the yellow ball at the right side of the board that is holding the SMALL wheel (the wheel should fall onto the board below it and then onto the one below that) the bottom board will then pivot and hit the red ball. After the red ball moves aim it at the board that is holding the BIG wheel and hit it. The big wheel should then fall and the actions should knock down the "building".
Distance of fall in T seconds = 1/2 g T2Distance of fall in 2 seconds = (1/2) (9.8) (2)2 = (4.9 x 4) = 19.6 metersHeight of this particular ball after 2 seconds = (70 - 19.6) = 50.4 meters
The mass is irrelevant. If the object is in free fall (that is, air resistance can be neglected), an object will fall 4.9 meters in one second.