Thursday

April 17, 2014

April 17, 2014

Posted by **Dave** on Thursday, November 15, 2012 at 11:33pm.

A) how long does it take for the red ball to strike the ground below?

B) If a black ball is dropped off the edge of the same building, how many seconds after the release of the red ball must the black ball be released so that they strike the ground at the same time

- PHYSICS Urgent help please -
**drwls**, Friday, November 16, 2012 at 4:22amA) Solve this equation for the time t:

Y = 10 + 4t -4.9 t^2 = 0

Take the positive root. There will be two solutions.

t = [-4 -sqrt(16 + 196)]/-9.8

= 1.89 s

B)The black ball that is dropped requires t = sqrt(2H/g)= 1.43 s to fall

To hit the ground at the same time as the red ball, delay its release by 1.89-1.43 = 0.46 seconds

**Related Questions**

physics - A red ball is thrown down with an initial speed of 1.0 m/s from a ...

Physics - A red ball is thrown down with an initial speed of 1.3 m/s from a ...

physics - A red ball is thrown down with an initial speed of 1.2 m/s from a ...

physics - A red ball is thrown up off the edge of a building 10 m tall with an ...

Physics - Kevin stands at the edge of a cliff, holding one ball in each hand. He...

college - A blue ball is thrown upward with an initial speed of 19.8 m/s, from ...

Physics - Two balls (Ball 1 and Ball 2) are released from the top of a tower. ...

Math Help (URGENT X10) - This is really urgent so please please please help. The...

phy - A blue ball is thrown upward with an initial speed of 20.6 m/s, from a ...

Physics - A ball is thrown straight up, when it reaches the maximum height x, a ...