. A mass m =1 kg located at point (3,4) in x-y plane at time t is subjected to a force of 2 N in the y direction. All numbers are in SI units. The angular acceleration is a) 0.24 radians s-2 along z direction b) 0.18 radians s-2 along z direction c) 0.12 radians s-2 along x direction d) 0.32 radians s-2 along z direction

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Please refer the link below 

It is simple T divided by mass moment of inertia

In this case torque is 2*3 =6N-m

Mass moment of inertia is 

5*(3^2+4^2) =25 hence angular acceleration  = 6/25 = 0.24. a is the correct choice

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