Question

mcq science bio
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Answer 1

Answer:

By Newton's second law

Force is propotional to rate of change of momentum and we finally have

F = dp/dt =d (mv)/dt = dm/dt*v+ m*dv/dt (But as per Einstein’s equation mass can be assumed to be constant at velocities <<< speed of light ) so this equation can be simplified to

=m*dv/dt = ma

Hence force required is equal to mass*acceleration = 50kg * 2ms

Explanation:

thanks

Answer 2

Answer:

20. i option d

20. ii option a

20. iii option c

20. iv option d

20. v option a