Constant Velocity

  • Thread starter celect
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  • #1
43
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How do I use Kinematic equation with constant velocity.
I only have used with intital and final velocity.



A parachute dropped from a 30-meter-high cliff falls with a constant
velocity of 1.5 meters per second. Twenty-two seconds later a stone is
dropped from the cliff.

a. How long does it take the parachute to hit the ground?


b. How long does it take the stone to hit the ground?
I solved this using d=v_i * t + 1/2 * a *t ^2

24.5 seconds
 

Answers and Replies

  • #2
Doc Al
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Originally posted by celect
How do I use Kinematic equation with constant velocity.
I only have used with intital and final velocity.
You can use the exact same equation by setting a=0. It simplifies to d = v*t ... I hope that equation looks familiar!
 
  • #3
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0
d=v*t+1/2*a*[tex]t^2[/tex]

-30m = (-1.5m/s)*t + 0.5 (0m/s)*[tex]t^2[/tex]

I come up with t=20s

Am I going in the right direction?
 
  • #4
650
1
yes, if the velocity remains contant
then a=0
 
  • #5
Doc Al
Mentor
45,137
1,436
Originally posted by celect
Am I going in the right direction?
Perfect.
 

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