Tuesday

July 29, 2014

July 29, 2014

Posted by **yelya** on Thursday, August 25, 2011 at 4:49pm.

- physics -
**Damon**, Thursday, August 25, 2011 at 5:16pmu = constant horizontal speed = 50/2.5 = 20 m/s

v = vi - 9.8 t

at top of arc, t = 2.5/2 = 1.25 seconds and v = 0

so at top

0 = vi - 9.8 (1.25)

so

vi = 12.25

so speed at start = sqrt (20^2 + 12.25^2)

= sqrt(400+ 150) = sqrt 550 = 23.5 m/s

tan angle = 12.25/20

so

angle = 31.5 degrees

**Related Questions**

physics - A ball launched from ground level lands 3 s later on a level field 48 ...

Physics - A ball launched from ground level lands 2.7 s later on a level field ...

physics - A golf ball is struck with a five iron on level ground. It lands 92.7 ...

Physics - A golf ball is struck with a five iron on level ground. It lands 85.0 ...

physics - A projectile is launched over level ground at a launch angle of 70o ...

johnny - A projectile is launched over level ground at a launch angle of 70o ...

Physics - A ball thrown into the air lands on the same horizontal level, 31 m ...

physics - A projectile is launched at an angle of 58.5 degrees above the ...

Physics - A tennis player hits a ball at ground level, giving it an initial ...

physics - A projectile is launched from ground level to the top of a cliff which...