JEE · NEET Previous Year Question

An object with mass 500 g moves along x -axis with speed . The force acting on the object is:

Topic: JEE PYQ

Answer: B. Full step-by-step solution below.

  1. A8 N
  2. B4 N
  3. C5 N
  4. D6 N

Correct answer: B

Solution

(b)
To find the force acting on the object, we use the formula , where is the force, is the mass, and is the acceleration.
To find the force acting on the object, we use the formula , where is the force, is the mass, and is the acceleration.
The velocity is given as .
Squaring both sides, we have .
Differentiate with respect to :

Solving for , we find:

The force is then calculated as:

Thus, the force acting on the object is 4 N.
The velocity is given as .
Squaring both sides, we have .
Differentiate with respect to :

Solving for , we find:

The force is then calculated as:

Thus, the force acting on the object is 4 N.

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