A Car of mass 1000kg applies a constant 200N breaking force over a distance of 30m and comes to a complete stop. How fast was the car going the instant the brakes were engaged.

Before we start we should have some idea of the route of our solution. We should observe that force, distance and work have a relation and that mass, velocity and work have a relation. So we should calculate the work done by the brakes stopping the car. W=FD so W = 20030=6000J We know work = change in energy and that the final energy is 0. So we now know that the starting energy of the car KE = 6000J We now look to the kinetic energy equation that states KE = 1/2 * m * v^2 solving for v we have v=sqrt(2KE/m) we now just plug in v = sqrt(26000/1000) = sqrt(12) = 3.46 ms^-1

SO
Answered by Sean O. Physics tutor

3194 Views

See similar Physics GCSE tutors

Related Physics GCSE answers

All answers ▸

Explain, in terms of pressure, how straws draw water into your mouth.


Please explain air resistance.


Draw a graph depicting a skydivers speed against time when jumping from a plane, until he deploys his parachute, explaining the logic of your answer through the forces applicable to the body.


A roller coaster car starts stationary at the top of a downwards slope. At the bottom of the slope, it has a speed of 30m/s. Use the conservation of energy to find the vertical height of the slope. (Use g=10 m/s^2)


We're here to help

contact us iconContact ustelephone icon+44 (0) 203 773 6020
Facebook logoInstagram logoLinkedIn logo

© MyTutorWeb Ltd 2013–2025

Terms & Conditions|Privacy Policy
Cookie Preferences