Question

In space, a block of mass 5.5 kg is moving initially at 6 m/s and has five forces acting
on it. If the forces on it are balanced, what will be its speed after 12 s?
(A) 1.2 m/s
(B) 6 m/s
(C) 12 m/s
(D) Depends upon the force F

Answer 1

Answer:

make me Brian list and follow

you should do the sam but i gave .

ex :-

Mass =5 kg

Velocity =4m/s

Net force will be 0 . This is because an object moving with a uniform speed has zero acceleration, there is no change in velocity.

And according to Newton's second law of motion, we know, Acceleration is directly proportional to Force.

If acceleration =0

Force = Mass × Acceleration

Force = Mass × 0

Force = 0

Thus, Net force acting on the body is 0.

Answer 2

Given : In space, a block of mass 5.5 kg is moving initially at 6 m/s and

has five forces acting on it.

The forces on it are balanced

To Find :  speed after 12 s  

(A) 1.2 m/s

(B) 6 m/s

(C) 12 m/s

(D) Depends upon the force F

Solution:

m = 5.5 kg

u = 6 m/s

t = 12 secs

F = ma

v = u + at

F = 0  as forces are balanced

=> 0 = 5.5(a)

=> a = 0

v = 6 + 0(12)

=> v = 6 + 0

=> v = 6

Hence  speed after 12 s  is 6 m/s

Correct option is B) 6 m/s

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