Posted by **urgent answer needed** on Saturday, June 15, 2013 at 4:43am.

A rocket accelerates straight up from rest for 20 seconds with an acceleration of 8 m/s2. After 20 seconds the rocket motor shuts off and the rocket continues to coast upwards. How high does the rocket go in meters?

Details and assumptions

You may take the acceleration of gravity as −9.8 m/s2.

You may neglect air resistance.

- physics -
**MathMate**, Saturday, June 15, 2013 at 7:29am
Acceleration phase:

initial velocity, v0 = 0 m/s

final velocity, v1 = at = 8*20 = 160 m/s

distance, S = ut+(1/2)at² = 0 + (1/2)8(20²)

=(1/2)8(400)=1600 m

Free fall phase:

v0 = 160 m/s

acceleration,a = -9.8 m/s²

v0 = 160 m/s

v1 = 0

a = g =-9.8 m/s²

use

v1²-v0²=2aS

to solve for S, distance.

Add this to the 1600 m in the acceleration phase to get the maximum height.

- physics -
**steve**, Friday, October 2, 2015 at 1:37pm
ewywer

## Answer this Question

## Related Questions

- physic - A rocket accelerates straight up from rest for 20 seconds with an ...
- Physics - A toy rocket is launched upwards from rest. The rocket engine will ...
- Physics - A rocket is fired vertically with an upward acceleration of 30 m/s2. ...
- physics - A test rocket is fired straight up from rest. The net acceleration is ...
- physics - A rocket, initially at rest on the ground, accelerates straight upward...
- physics - A rocket is launched straight up with a constant acceleration. Three ...
- physics - A rocket is fired straight up and accelerates upward at 24 m/s2 for 12...
- physics - Rockets A and B are fired straight upward from rest. Rocket A is ...
- Physics - A rocket of mass 1.0x10^3kg is being fired to a height of 5.0 x 10^3 m...
- physics - You have designed a rocket to be used to sample the local atmosphere ...

More Related Questions