A marble is flicked horizontally off a desk with a speed of 3.1 m/s. If it takes the marble 0.8 seconds to hit the ground, how far from the desk does it land?

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Answer 1 · 2017-11-23T12:01:50

It falls 2.48 m far away from the desk.

Velocity along horizontal is #"3.1 m/s"#
There is no acceleration along horizontal direction throughout its motion. So,

Horizontal displacement = Horizontal velocity × Time

#x_"horizontal" = "3.1 m"/cancel"s" × 0.8 cancel"s" = "2.48 m"#

Answer 2 · 2017-11-23T12:06:13

I got #2.5m#

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