Friday

August 22, 2014

August 22, 2014

Posted by **Rachel** on Monday, February 4, 2013 at 8:12pm.

(a) How long is the ball in the air?

t =

(b) What is its speed at the instant it leaves the table?

v =

- Physics -
**Wang**, Tuesday, February 5, 2013 at 6:09pmThe answer is:

(a) SQRT(2h/g)

(b) (x/ SQRT(2h/g)

It's explain in this link by someone.

"A) You don't know anything about your final velocity, so you can't try to use that in the answer. The only things we have available to use in our equations are acceleration, height (distance), and initial velocity (zero, in the y direction).

We use the kinematic equation h = Vot+0.5gt2. Since Vo=0, this rearranges to t = (2h/g)1/2

B) In the first instant of the freefall, there will be no y component to the velocity, so we say that Vx=Vtotal. Next, we recall that horizontal velocity remains constant in a free fall.

So, we use the definition of velocity, displacement/time, and just plug in so that v=x/t, where t is the result you got in part A."

**Related Questions**

Math/Physics - A ball rolls horizontally off the edge of a tabletop that is 1.60...

physics - A small ball rolls horizontally off the edge of a tabletop that is 1.2...

physics - A ball rolls horizontally off the edge of a tabletop that is 1.0m high...

Physics - Projectile Motion - A ball rolls horizontally off the edge of a ...

Physics - A small ball rolls horizontally off the edge of a table that is 1.20 m...

Physics - A ball rolls horizontally off the edge of a tabletop that is 1.80 m ...

physics - A tennis ball rolls off the edge of a tabletop 0.800m above the floor ...

physics - A steel ball rolls with constant velocity across a tabletop 0.950m ...

Physics - A ball rolls off a tabletop 0.900 m above the floor and lands on the ...

physics - A ball rolls with a speed of 4.4 m/s toward the edge of a table that ...