Question

what force is required for applying on a 10kg body so, it moves down in vaccum with an acceleration of 3m/sec²
A. 42N
B. 46N
C. 48N
D. 53N
E. 58N​

Answer 1

There is a downward force of 98N acting already, it has to move down with an acceleration of 3m/s^2, so let us suppose we have to apply a force of x N.

So in effect 98 + x = 30

x = 58

Negative specifies that the force should be opposite to that of the direction of gravity.