1

JEE Main 2021 (Online) 31st August Evening Shift

MCQ (Single Correct Answer)

+4

-1

A block moving horizontally on a smooth surface with a speed of 40 m/s splits into two parts with masses in the ratio of 1 : 2. If the smaller part moves at 60 m/s in the same direction, then the fractional change in kinetic energy is :-

2

JEE Main 2021 (Online) 27th July Evening Shift

MCQ (Single Correct Answer)

+4

-1

Given below is the plot of a potential energy function U(x) for a system, in which a particle is in one dimensional motion, while a conservative force F(x) acts on it. Suppose that E

[ where K.E. = kinetic energy ]

_{mech}= 8 J, the incorrect statement for this system is :[ where K.E. = kinetic energy ]

3

JEE Main 2021 (Online) 27th July Evening Shift

MCQ (Single Correct Answer)

+4

-1

An automobile of mass 'm' accelerates starting from origin and initially at rest, while the engine supplies constant power P. The position is given as a function of time by :

4

JEE Main 2021 (Online) 22th July Evening Shift

MCQ (Single Correct Answer)

+4

-1

A porter lifts a heavy suitcase of mass 80 kg and at the destination lowers it down by a distance of 80 cm with a constant velocity. Calculate the work done by the porter in lowering the suitcase.

(take g = 9.8 ms

(take g = 9.8 ms

^{$$-$$2})Questions Asked from Work Power & Energy (MCQ (Single Correct Answer))

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