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1 V2 12. The escape velocity of a body f...

1 V2 12. The escape velocity of a body from the surface of a planet is Ve. A particle starts from rest at a large distance from the planet, reaches the planet only under gravitational attraction, and passes through a smooth tunnel along the diameter of the planet. Speed of body when it passes through the centre of the planet will be (2) (3) ve (4) Zero The stress developed in doubling the length of a wire of Young's modulus Y is (Assuming that wire maintains its elasticity) (1) 44 1212

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