a car of mass 800 kg travelling with a belocity of 20m/s. When brakes are applied,it stops after travelling a distance of 8 meters. Find retardation and retardation force
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mass m =800kg
distance travelled S=8m
initial velocity u =20m/s
final velocity V =0m/s as the brake is applied to stop the car
using v^2-u^2=2aS
0-20^2=2a x 8
a=-400/16
a=-25m/sec.square
therefore force F =ma
F=800x -25
F=-20,000N
hence the retarding force to stop the car is -20,000N
distance travelled S=8m
initial velocity u =20m/s
final velocity V =0m/s as the brake is applied to stop the car
using v^2-u^2=2aS
0-20^2=2a x 8
a=-400/16
a=-25m/sec.square
therefore force F =ma
F=800x -25
F=-20,000N
hence the retarding force to stop the car is -20,000N
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