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December 22, 2014

December 22, 2014

Posted by **juanita** on Saturday, November 24, 2012 at 8:19pm.

a)Determine the maximum height reached by the projectile.

b)Determine the total time in the air.

c)Determine the total horizontal distance covered (that is, the range).

d)Determine the speed of the projectile 1.44s after firing.

e)Determine the direction of the projectile 1.44s after firing.

- physics i really need help :( -
**Damon**, Saturday, November 24, 2012 at 8:41pma

vertical problem

vi = 61.3 sin 31.5 = 32 m/s up

when at top (v = 0) ?

o = 32 - 9.81 t

t = 3.26 seconds to max ht

how high?

h = Vi t - (1/2)(9.81)t^2

h = 32 (3.26) - 4.9(10.7)

= 51.9 m high

-------------

easier way by the way:

average speed up = 32/2 = 16m/s for 3.26 seconds --> 52 m

--------------------------

b

time in air = twice the time up = 3.26*2 = 6.52 seconds

c

horizontal problem

constant horizontal speed = 61.3 cos 31.5 = 52.3 m/s

time is still 6.52 s

range = 52.3 * 6.52 = 341 meters

d

vertical problem

v = 32 - 9.81 (1.44)

= 17.9 m/s

horizontal speed is always 52.3

s = sqrt(17.9^2+2.3)^2

e

tan angle up from hor = 17.9/52.3

= 18.9 degrees up from horizontal

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