A missile is launched with a velocity less than the escape velocity. The sum of its kinetic and potential energy is
Positive
Negative
Zero
may be positive or negative
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The distance between centre of the earth and moon is 384000 km. If the mass of the earth is 6 × 1024 kg and G = 6.66 × 10–11 Nm2/kg2. The speed of the moon is nearly