Calculating Force of Gravity on an Alien Frog

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Homework Help Overview

The problem involves calculating the force of gravity on an alien frog with a known mass and initial velocity, as it jumps to a maximum height on an unknown planet. The context is rooted in kinematics and the effects of gravity.

Discussion Character

  • Exploratory, Mathematical reasoning, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the nature of the problem as one involving constant acceleration and kinematics. There are attempts to identify relevant equations and clarify the initial conditions and variables involved.

Discussion Status

Some participants have offered hints and guidance on identifying equations of motion and suggested methods for finding time and acceleration. There is an ongoing exploration of the problem without a clear consensus on the approach.

Contextual Notes

Participants express uncertainty about the material covered in class and the specific equations applicable to the problem, indicating a need for clarification on kinematic principles.

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Homework Statement



An alien form of frog with a mass of 1.5kg (on a planet with an unknown acceleration of gravity) jumps up from his lilly pad at a velocity of 4.0m/s. If the frog reaches a maximum height of 15m, what is the force of gravity on the frog on this planet?

It's a stupid question but I am totally stuck on it??
 
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hint: this's a constant acceleration problem
 
Sorry I totally missed the days that we went over this in class. I am not sure where to start with a constant acceleration problem?
 
perhaps first identify what are the equations you have learn about kinematics with constant acceleration.. (can easily google them). then identify what is given in question, and what you what to work out.
 
I think you can solve this using the equations of motion and algebra. First find the time using the following equation:

v = u + at

When the frog reaches his maximum height, v = 0 m/s.

Then use the following formula:

s = ut + 0.5a(t^2)

Here s is the vertical height (15m) reached. You'll have to do a bit of substitution from the first formula, since both a and t are unknowns.

I hope that helps. :)
 

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