Physics · 2016
JEE Main · 9 April 2016, Shift 1 · Q4
A car of weight W is on an inclined road that rises by 100 m over a distance of 1 km and applies a constant frictional force W/20 on the car. While…
A car of weight $\displaystyle W$ is on an inclined road that rises by $\displaystyle 100$ m over a distance of $\displaystyle 1$ km and applies a constant frictional force $\displaystyle \frac{W}{20}$ on the car. While moving uphill on the road at a speed of $\displaystyle 10 \mathrm{~ms}^{-1}$, the car needs power $\displaystyle P$. If it needs power $\displaystyle \frac{P}{2}$ while moving downhill at speed $\displaystyle v$ then value of $\displaystyle v$ is :
Official answer
(2)
$\displaystyle 15 \mathrm{~ms}^{-1}$
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
- The average mass of rain drops is 3.0 × 10^-5 kg and their average terminal velocity is 9 m / s. Calculate the energy transferred by rain to each…2014
- 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 force acts on a 2 kg object so that its position is given as a function of time as x=3 t^2+5. What is the work done by this force in first 5…2019
- 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
- A body of mass m starts moving from rest along x -axis so that its velocity varies as v=a √s where a is a constant and s is the distance covered by…2018
JEE Main 2016 Physics question, with the answer from NTA’s final answer key. Where our answers come from.