Wednesday

April 16, 2014

April 16, 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 is launched from ground level at 31.8 m/s at an angle of 35° ...

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

Physics - A ball is thrown horizontally from a platform so that the initial ...

Physics - A ball is thrown horizontally from a platform so that the initial ...

physics - 10. A cannon elevated at an angle of 35º to the horizontal fires a ...

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

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

physics - On a distant planet, golf is just as popular as it is on earth. A ...

physics - three more questions: 1) A 1.50kg projectile is launched at 18.0m/s ...