9. WHERE SHOULD YOU START MAKING A U-TURN WHEN DRIVING ON A DIVIDED STREET WITH MULTIPLE LANES IN YOUR DIRECTION? A. On the shou
2 answers:
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Explanation:
Let the speeds of father and son are . The kinetic energies of father and son are
. The mass of father and son are
(a) According to given conditions,
And
Kinetic energy of father is given by :
.............(1)
Kinetic energy of son is given by :
...........(2)
From equation (1), (2) we get :
..............(3)
If the speed of father is speed up by 1.5 m/s, so the ratio of kinetic energies is given by :
Using equation (3) in above equation, we get :
(b) Put the value of in equation (3) as :
Hence, this is the required solution.