A 5.4 g lead bullet moving at 261 m/s strikes a steel plate and stops. If all its kinetic energy is converted to thermal energy
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Answer:
There is an interval of 24.28s in which the rocket is above the ground.
Explanation:
From Kinematics, the position as a function of time when the engine still works will be:
At what time the altitud will be ?
⇒
Using the quadratic formula: .
How much time does it take for the rocket to touch the ground? No the function of position is:
Where our new initial position is , the velocity when the engine breaks is
and the only acceleration comes from gravity (which points down).
Now, when the rocket tounches the ground:
Again, using the quadratic ecuation:
Now, the total time from the moment it takes off and the moment it tounches the ground will be:
.