Question

An
object is launched from the top of a building which is 50 m tall at
a speed of 20 m/s at an angle of 30 degrees above the horizontal.

a) What is the component of the projectile's initial velocity
parallel to the ground?

b) What is the component of the projectile's velocity parallel
to the ground at 0.5 s?

c) What is the speed (magnitude of velocity) of the projectile
at 3 s?

d) How long does it take for its angle of trajectory to be
equal to zero degrees?

e) What is the projectile's maximum HEIGHT relative to the
ground?

f) What angle does the projectile strike the ground?

Answer #1

a) initial velocity parallel to ground = Vo cos(30)

= 20m/s cos(30) = 17.3 m/s

b) As there is no force or component of any force acting on projectile, parallel to ground, it's velocity parallel to ground remains constant. At t =0.5 sec, velocity parallel to ground = 17.3 m/s

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