A motor car of mass 800kg travelling at 20m/s is brought to rest by brake in 100m.calculate the average braking force required.in physics

Answer 1

Vf^2=vi^2 + 2ad

solve for acceleration a.

Then, remember Force=m*a ? solve for force.

Answer 2

Vf^2 = Vi +2ad
Data
Vi=20.0 m/s
Vf=0m/s ( at rest)
dx=100m
a=?
Force?
(O)^2=(20)^2 +2a(100)
-400=200a
a=-2m/s^2
Force=ma
:= -2(800)
= -1600N

Answer 3

Vf^2=vi^2 + 2ad

solve for acceleration a.

Then, remember Force=m*a ? solve for force.

👤
bobpursley
Feb 7, 2016


Vf^2 = Vi +2ad
Data
Vi=20.0 m/s
Vf=0m/s ( at rest)
dx=100m
a=?
Force?
(O)^2=(20)^2 +2a(100)
-400=200a
a=-2m/s^2
Force=ma
:= -2(800)
= -1600N