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September 21, 2014

September 21, 2014

Posted by **sundus** on Tuesday, September 22, 2009 at 8:44pm.

(a) Determine the time taken by the projectile to hit point P at ground level.

(b) Determine the range X of the projectile as measured from the base of the cliff.

(c) At the instant just before the projectile hits point P, find the horizontal and the vertical components of its velocity (take up and to the right as positive directions).

(d) What is the the magnitude of the velocity?

(e) What is the angle made by the velocity vector with the horizontal?

- 12th grade -
**MathMate**, Tuesday, September 22, 2009 at 10:19pmWe don't get to see the figure 3-39, but I assume that the angle 37° is an angle of elevation, that is, it is shot upwards.

Resolve the velocity into the horizontal (cos37°) and vertical (sin37°) components.

Without air resistance, the horizontal component will not vary, i.e. it is a constant velocity.

The vertical component can be treated like a projectile shot vertically upwards, and the usual kinematics formulae will apply.

v0=115sin37° m/s

a=-9.8 m/s/s

S= -125 m when it hits the ground

t=time in seconds

2aS = v0t+(1/2)at²

Solve for the quadratic to get t.

Can you take it from here?

- 12th grade -
**me**, Monday, July 5, 2010 at 3:00pmstuff

- 12th grade -
**noah**, Thursday, June 23, 2011 at 2:24amy 2aS = v0t+(1/2)at² ?????

- AP Physics -
**MLS**, Saturday, September 3, 2011 at 12:22pmI need help with the same problem! :(

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