The same retarding force is applied to stop a | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(D) From the work-energy theorem,the work done by the retarding force $F$ is equal to the change in kinetic energy of the train.$|W| = |\Delta K|$$F \

Vedclass · Accepted Answer

Four times

Vedclass · Answer

(D) From the work-energy theorem,the work done by the retarding force $F$ is equal to the change in kinetic energy of the train.$|W| = |\Delta K|$$F \cdot S = \frac{1}{2} m u^2$Since the retarding force $F$ and the mass $m$ are constant,the stopping distance $S$ is directly proportional to the square of the initial velocity $u$,i.e.,$S \propto u^2$.Given that the initial speed is doubled $(u' = 2u)$,the new stopping distance $S'$ will be:$S' \propto (2u)^2 = 4u^2$$S' = 4S$$S' = 4 	imes 80 \ m = 320 \ m$.Therefore,the stopping distance becomes four times the original distance.

The same retarding force is applied to stop a train. The train stops after $80 \ m$. If the speed is doubled,then the distance will be

Similar Questions

If $\frac{x-4}{x^2-5x-2k} = \frac{2}{x-2} - \frac{1}{x+k}$,then $k$ is equal to

The offspring produced from the cross between two pure parents are more vigorous and high-yielding. What is this phenomenon called?

Which of the following oxides is strongly basic?

$A$ cannon shell fired breaks into two equal parts at its highest point. One part retraces its path to the cannon with kinetic energy $E_1$,and the kinetic energy of the second part is $E_2$. The relation between $E_1$ and $E_2$ is:

In the Fraunhofer diffraction experiment,$L$ is the distance between the screen and the obstacle,$b$ is the size of the obstacle,and $\lambda$ is the wavelength of the incident light. The general condition for the applicability of Fraunhofer diffraction is:

Vedclass Test Series

Exam Paper Generator

Online Exam Module