Physics
A body of mass 2 kg is thrown upward with initial velocity of 20 m/s. After 2 seconds, its kinetic energy will be : (g = 10 m/s2)

200 J
400 J
0 J
100 J

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Physics
Which one of the following statements with regard to Jet stream, an upper level tropospheric wave, is not correct?

In summer, the polar front jet achieves its maximum force.
It is narrow band of high-velocity wind.
It follows the wave path near the tropopause at elevations of 8 km to 15 km.
Jet streams are typically continuous over long distances.

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