Homework Help: physics HELP

Posted by anonymous on Tuesday, November 30, 2010 at 5:15pm.

A projectile is fired with an initial speed of 1000 m/s at an angle of 37 degrees above the horizontal. If air resistance is neglected, the horizontal component of the projectile's velocity after 20 s is approximately

A) 600 m/s
B) 800 m/s
C) 640 m/s
D) 40 m/s
E) 160 m/s

please help to solve this problem! thanks

physics HELP - Henry, Thursday, December 2, 2010 at 11:01am
Vf = Vo + g*t.

Vf = 1000 * cos37 + 9.8 * 20,
Vf = 798.6 + (-196) = 602.6 m / s.
physics HELP - Henry, Thursday, December 2, 2010 at 11:14am
CORRECTION:

Vf = 1000 + (-9.8) * 20 = 1000 -196 = 804 @ 37 deg.

Vf(hor) = 804cos37 = 642 m /s.

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