A ball is projected horizontally with a velocity of 30m/s from the top of a high tower. Air resistance may be neglected. After what time will it's velocity be in the direction 45 degrees to the horizontal?

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15-09-2014
Physics

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A ball is projected horizontally with a velocity of 30m/s from the top of a high tower. Air resistance may be neglected. After what time will it's velocity be in the direction 45 degrees to the horizontal?

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AL2006 AL2006 · Answer 1 · 2014-09-15T19:11:43-04:00

AL2006 AL2006

15-09-2014

Its velocity will point down 45 degrees when its vertical speed has grown to 30 m/s to match its horizontal speed.

Gravity is increasing the downward speed of the ball by 9.8m/s every second.

So its downward speed will be 30 m/s after (30) / (9.8) = 3.06 seconds

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