- #1
Sentience
- 78
- 0
Homework Statement
A rocket, initially at rest on the ground, accelerates straight upward from rest with constant acceleration 34.3 m/s^2. The acceleration period lasts for time 10.0 s until the fuel is exhausted. After that, the rocket is in free fall.
Find the maximum height y_max reached by the rocket. Ignore air resistance and assume a constant acceleration due to gravity equal to 9.80 \rm{m/s^2} .
Homework Equations
V = Vo + at
X - Xo = Vot + .5at2
v2 = vo2 + 2a(X - Xo)
X - Xo = .5(Vo + V)t
The Attempt at a Solution
I split the problem in 2, with part A being when the rocket is accelerating with fuel and part B being only under the influence of gravity.
During part A, it reaches a height of 1720 M. When I solve for the height in part B using the other data from part A, I get a total distance of 7720 meters, which implies it gained an addiotional 6000 meters.
How can the rocket go further while only under the influence of gravity after the fuel is gone? Is it because its velocity diminishes very gradually?
Perhaps this is just a classical case of science being counter-intuitive, but I was baffled when I calculated that second height.