Pi Man
New member
- Joined
- Oct 16, 2012
- Messages
- 6
Hey I have another problem here. Apparently someone wants to go to mars just to throw rocks. Anyway, this is the question:
If a rock is thrown vertically upward from the surface of mars with a velocity of 15m/s, it's height after t seconds is h = 15t - 1.86t^2
What is the velocity of the rock when its height is 25 m on it's way up? On it's way down.
The answer says it is 6.24 up and 6.24 down
I don't know how it got that answer. I set both the derivative and the original equation to 25 and solved but I did not get that answer. What am I doing wrong? Can anyone help?
If a rock is thrown vertically upward from the surface of mars with a velocity of 15m/s, it's height after t seconds is h = 15t - 1.86t^2
What is the velocity of the rock when its height is 25 m on it's way up? On it's way down.
The answer says it is 6.24 up and 6.24 down
I don't know how it got that answer. I set both the derivative and the original equation to 25 and solved but I did not get that answer. What am I doing wrong? Can anyone help?