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A space vehicle deploys its re-entry parachute when it's traveling at a vertical velocity of -150 meters/second (negative because the parachute is going down.) It comes to rest at 0 meters/second after 30 seconds. What's the average acceleration of the shuttle during this time span?

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pmayl
The initial velocity is -150m/s.
Remember that:
V(t) = Vi + at, where v(t) is velocity at time t, Vi is initial velocity, and a is acceleration.
We know that the vehicle stopped after 30 seconds, so V(30) = 0.
Let's plug the useful info into our function and solve for a:
0 = -150 + a*30     Add 150 to both sides
150 = 30a             Divide both sides by 30
a = 5 m/s²
The average acceleration is 5 meters per second squared. 
KINGOFSPADES99

Answer:

The initial velocity is -150m/s.

Remember that:

V(t) = Vi + at, where v(t) is velocity at time t, Vi is initial velocity, and a is acceleration.

We know that the vehicle stopped after 30 seconds, so V(30) = 0.

Let's plug the useful info into our function and solve for a:

0 = -150 + a*30     Add 150 to both sides

150 = 30a             Divide both sides by 30

a = 5 m/s²

The average acceleration is 5 meters per second squared. 

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