Question

Q. If the velocity-time graph representing the motion of a body is parallel to time-axis, then the net force acting on the body is:

(a) 10N (b) 100N (c) 1N (d) None ​

Answer 1

Answer:

(d)

Explanation:

if velocity time graph representing the motion of body is parallel to time axis, it means velocity is not changing with time i.e. velocity is constant.

if velocity is constant that means there is no acceleration

$a = \binom{dv}{dt} = 0$

and thus

$f = ma = 0$

Answer 2

Given : velocity-time graph representing the motion of a body is parallel to time-axis,  

To Find : the net force acting on the body

Solution:

velocity-time graph representing the motion of a body is parallel to time-axis,  

Hence dv/dt  = 0

Hence there is no change in velocity with change in time

=> a = dv/dt  = 0

Force = mass * acceleration

F = ma

a = 0

=> F = 0

Hence the net force acting on the body is ZERO (none)

No net force is acting

Correct option is d) None

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