JEE Main 2025 (Online) 7th April Evening Shift | Work Power & Energy Question 14 | Physics

An object of mass 1000 g experiences a time dependent force $\vec{F}=\left(2 t \hat{i}+3 t^2 \hat{j}\right) N$. The power generated by the force at time $t$ is:

$\left(2 t^2+18 t^3\right) W$

$\left(3 t^3+5 t^5\right) w$

$\left(2 t^3+3 t^5\right) w$

$\left(2 t^2+3 t^3\right) w$

JEE Main 2025 (Online) 4th April Evening Shift

MCQ (Single Correct Answer)

-1

A block of mass 25 kg is pulled along a horizontal surface by a force at an angle $45^{\circ}$ with the horizontal. The friction coefficient between the block and the surface is 0.25 . The block travels at a uniform velocity. The work done by the applied force during a displacement of 5 m of the block is :

490 J

970 J

735 J

245 J

JEE Main 2025 (Online) 3rd April Morning Shift

MCQ (Single Correct Answer)

-1

A particle is released from height $S$ above the surface of the earth. At certain height its kinetic energy is three times its potential energy. The height from the surface of the earth and the speed of the particle at that instant are respectively.

$\frac{\mathrm{S}}{4}, \frac{3 \mathrm{gS}}{2}$

$\frac{\mathrm{S}}{2}, \frac{3 \mathrm{gS}}{2}$

$\frac{\mathrm{S}}{4}, \sqrt{\frac{3 \mathrm{gS}}{2}}$

$\frac{\mathrm{S}}{2}, \sqrt{\frac{3 \mathrm{gS}}{2}}$

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