A body of mass m in freefall, with no air friction, falling a distance d with ve

Question

A body of mass m in freefall, with no air friction, falling a distance d with velocity v, experiences a net force of magnitude A. 1/2 mv^2 B. mv C. 1/2 md^2 D. mg Two bodies, one of mass m and one of mass 2m are dropped from the same height at the same time, in freefall with no air friction. Which hits the ground first? A. mass m B. mass 2m C. they hit at the same time D. impossible to say Viscous force in a fluid medium for a sphere of radius r, in laminar flow conditions, is proportional to: A. velocity B. viscosity C. radius D. A, B, and C

Explanation / Answer

1) (D) mg

F = mg

A freely falling body has acceleration equal to "g". So

F = mg

2)(C)They hit at the same time

we know that,

t = sqrt(2h/g)

time taken is independent of mass of the body.

3)(D)Velocity

viscous force is:

F = -(eta) A v/x

is proportional to all three.

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