Question

Q1. Two bodies of equal masses move with uniform velocities v and 3 V, respectively. Find the ratio of their kinetic energies.

Answer 1

Answer:

Let the mass of each body be m

K.E. of the first body K1=$\frac{1}{2} mv^{2}$

K.E. of the first body K2=$\frac{1}{2} mv^{2} (3v)^{2}$

Ratio of the kinetic energy=

=$\frac{K1}{K2_{2} } \\=\frac{\frac{1}{2mv^{2} } }{\frac{1}{2m.9v^{2} } } \\\frac{1}{9} \\1:9$