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dashpup dashpup
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12 years ago
"A ball is thrown horizontally with an initial velocity of 20.0 meters per second from the top of a tower 60.0 meters high. What is the horizontal velocity of the ball just before it reaches the ground?"
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12 years ago
horizontal velocity doesnt change! (except for a little bit due to air resistance, which is usually ignored) remember, acceleration is change in velocity, and newton's first law (F=ma) tells us that if there is no force, there is no acceleration. there is one force here, gravity--but that's an up-and-down force, not side-to-side. so because there are no side-to-side forces, there is no horizontal acceleration--which means there is no change in horizontal velocity. so it's the same as it was when it started--20.0 m/s
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