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Finding instantaneous velocity of objects in projectile motion

  • Thread starter Suzan
  • Start date
3
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1. Homework Statement
No air resitance
Initial speed 8 m/s
inst. time at 3 s

Find instantaneous velocity at 3s.

Components of displacement:
dx= 24
dy= 44


2. Homework Equations

d=v1t+(1/2)a(t)^2 or other kinematics equations

3. The Attempt at a Solution

I tried to find the components of the velocity using the components of the displacement (d/t=v). But both my answer and angle of direction were wrong. How do i do this?
 

Answers and Replies

rock.freak667
Homework Helper
6,230
31
1. Homework Statement
No air resitance
Initial speed 8 m/s
inst. time at 3 s

Find instantaneous velocity at 3s.

Components of displacement:
dx= 24
dy= 44
So dx and dy are those values at t=3?
If so consider Vertical motion:
[itex]s=ut+\frac{1}{2}at^2[/itex]

where u is the initial vertical velocity. Sub t=3 in there and get u. and well you know how to get the horizontal component (v=d/t as you stated before)
 

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