Finding max height and speed before it hits the ground of a rocket

  • Thread starter llach
  • Start date
  • #1
3
0

Homework Statement



A model rocket initially at rest on the ground is fired vertically upward, and the engine thrust produces a constant acceleration a = 40 m/s2. After running for 2.5 s the engine is cut off and then the rocket is in free fall. (a) Find the maximum height that the rocket reaches. (b) Find the speed of the rocket just before it hits the ground.
Ans: (b) 635 m (c) 112 m/s
Note: The rocket travels with 40 m/s2 acceleration during the first 2.5 s (gravity effect included).


Homework Equations





The Attempt at a Solution

 

Answers and Replies

  • #2
rl.bhat
Homework Helper
4,433
8
In the relevant equations, can you write the kinematic equations. And using the given data, you can select a proper equation to solve the problem.
 

Related Threads on Finding max height and speed before it hits the ground of a rocket

Replies
8
Views
5K
Replies
2
Views
3K
  • Last Post
Replies
1
Views
1K
Replies
21
Views
1K
Replies
4
Views
26K
Top