Chapter 7
Work, Energy, and Simple Machines
CBSE Class 9
Science Solutions
Educart Science class Class 9 NCERT Exemplar cover
Question:

Will two children of different masses reach the bottom of the same slide with the same velocity? [Pg. No. 116]

Answer: Verified

Yes, both children will reach the bottom with the same velocity if friction and air resistance are ignored. This is because gravitational potential energy converts into kinetic energy, and when we equate mgh=12mv2mgh = \frac{1}{2}mv^2, mass cancels out. So, the final speed depends only on height, not on mass.

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