# Conceptual Newtons laws of motion question- mass and weight

1. Oct 11, 2005

You have just landed on Planet X. You take out a ball of mass , release it from rest from a height of and measure that it takes a time of to reach the ground. You can ignore any force on the ball from the atmosphere of the planet.

How much does the ball weigh on the surface of Planet X?

2. Oct 11, 2005

### Staff: Mentor

Hint: Find the acceleration due to gravity.

3. Oct 11, 2005

i know that w=m*g
so i assumed that g would be equal to h/t. But apparently that is incorrect. Any help would be greatly appreciated!

4. Oct 11, 2005

### Staff: Mentor

The units aren't even correct! (h/t would be a speed, not an acceleration.)

What's the kinematic formula connecting distance, time, and acceleration for uniformly accelerated motion?

5. Oct 11, 2005

x=x_0+v_0*t+(1/2)a*t^2

so would the acceleration be h/(.5t^2)

and the final answer be mass*(h/(.5t^2))

6. Oct 11, 2005

### Staff: Mentor

Sounds good to me.