Question

2) A mass accelerates uniformly when the
resultant force acting on it is:
(a) Zero
(b) Constant but not zero
(c) Increases uniformly with respect to time
(d) Both a and c​

Answer 1

Answer:

Hey,

Your answer is option a

i.e. zero

Answer 2

Answer:

The correct option is b) Constant but not zero.

b) Constant but not zero. Explanation:

• According to Newton's 2nd Law of motion, Change in momentum is directly proportional to force.
• $f \: = \frac{dp}{dt} = ma$
• f is the force, dp/dt is the time rate change of momentum, p is the momentum and t is the time. m is mass and acceleration is a.
• Hence, From the equation, F = ma, m is constant.
• F is directly proportional to acceleration.
• So, whenever there is acceleration, there is force and vice versa.
• When force will be zero, there will be no acceleration.
• Hence, for an accelerated motion, there must be a force which should be constant and not zero.

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