Physics · 2021
JEE Main · 22 July 2021, Shift 2 · Q14
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…
A porter lifts a heavy suitcase of mass $\displaystyle 80$ kg and at the destination lowers it down by a distance of $\displaystyle 80$ cm with a constant velocity. Calculate the workdone by the porter in lowering the suitcase.
(take $\displaystyle \mathrm{g}=9.8 \mathrm{~ms}^{-2}$ )
Official answer
(3)
$\displaystyle 627.2$ J
More from Work, Power and Energy
- A block of mass 2 kg moving on a horizontal surface with speed of 4 ms^-1 enters a rough surface ranging from x=0.5 m to x=1.5 m. The retarding force…2022
- A particle is placed at the point A of a frictionless track A B C as shown in figure. It is gently pushed towards right. The speed of the particle…2024
- A particle of mass m moves on a straight line with its velocity increasing with distance according to the equation v=α √x, where α is a constant. The…2024
- If momentum of a body is increased by 20 %, then its kinetic energy increases by2022
- A bullet of mass 0.1 kg is fired on a wooden block to pierce through it, but it stops after moving a distance of 50 cm into it. If the velocity of…2021
- As shown in the figure, a particle of mass 10 kg is placed at a point A. When the particle is slightly displaced to its right, it starts moving and…2021
- Two bodies are having kinetic energies in the ratio 16: 9. If they have same linear momentum, the ratio of their masses respectively is:2023
- A block of mass 100 kg slides over a distance of 10 m on a horizontal surface. If the co-efficient of friction between the surfaces is 0.4, then the…2024
JEE Main 2021 Physics question, with the answer from NTA’s final answer key. Where our answers come from.