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A ball is thrown with enough speed straight up so that it is in the air several seconds What is its velocity 2s before it reaches its highest point?
Wiki User
∙ 14y ago
All the time the ball is in the air, its acceleration is 9.8 meters (32.2 feet) per second2 downward. In other words ...
Every second it's in the air, its downward speed is that much faster than it was one second earlier.
When it reaches its highest point, its speed will be zero.
Two seconds earlier, its DOWNWARD speed was that much LESS than it is at the top. In other words ...
Its UPWARD speed was that much MORE than it is now.
So 2 seconds ago, its upward speed was (2 x 9.8) = 19.6 meters per second / (2 x 32.2) = 64.4 feet per second.
Wiki User
∙ 14y ago
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What is the acceleration of a car that maintains a constant velocity of 100km per h for 10 seconds?
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