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)

0 J
200 J
100 J
400 J

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Physics
Isotopes of an element contain

the same number of neutrons but different number of protons
equal number of nucleons
equal number of protons and electrons
the same number of protons but different number of neutrons

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