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Young's Modulus of Elasticity

61. 2 bodies ...

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61. 2 bodies of masses m and Maine are allowed to fall from the same height. If air resistance be same for each body , will the 2 bodies reach the earth simultaneously? Justify

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Q. Assertion :Two bodies of masses

M

m (M > m)

are allowed to fall from the same height if the air resistance for each be the same then both the bodies will reach the earth simultaneously. Reason: For same air resistance, acceleration of both the bodies will be same.

Q. Assertion :Two bodies of unequal masses

m_{1}

m_{2}

are dropped from the same height. If the resistance force offered by air to the motion of both bodies is the same, the bodies will reach the earth at the same time. Reason: For equal air resistance, acceleration of fall of masses

m_{1}

m_{2}

will be different.

Q. Two bodies of different masses are dropped simultaneously from same height,If air friction acting them is directly proportional to the square of their mass then

Q. Two identical bodies are allowed to fall from different heights

h_{1}

h_{2}

. The ratio of their momentum when they reach the ground will be

Q. Two objects A and B are thrown upward simultaneously with the same speed. The mass of A is greater than that of B. Suppose the air exerts a constant and equal force of resistance on the two bodies.
(a) The two bodies will reach the same height.
(b) A will go higher than B.

(c) B will go higher than A.
(d) Any of the above three may happen depending on the speed with which the objects are thrown.

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