Question

Adjoining figure shows a force of 40 N acting at 30° to the horizontal on a body of mass 5kg
on a smooth horizontal surface. Assuming that the acceleration of free - fall is 10 m/s, which
7.
40N
following statements is (are) correct ? (MAQ)
a) The horizontal force acting on the body is 20 N
b) The weight of the 5kg mass acts vertically downwards
c) The net vertical force acting on the body is 30 N
d) The net vertical force acting on the body is ON
​

Answer 1

Answer:

Opt c

Explanation:

The horizontal force of the body

F(h)=40cos30

=20root3 N

So by this we know that the first opt is incorrect.

Weight of the body=mg

=5×10=50N

So the 2nd opt is also incorrect.

Net vertical force=mg-vertical component of

the force applied

=50-Fsin30

=50-20=30N

So the 3rd opt is correct.

4th opt is not correct because the net force is 30N