a car of mass 800g is travelling with a velocity of 20m/s . when the brakes are applied. it stops after travelling a distance of 8m.find the retarding force and retardation 

Asked by kishor.kp14 | 24th Sep, 2019, 11:19: AM

Expert Answer:

When brakes are applied the car stops hence v=0
v squared equals u squared plus 2 a s
0 squared equals 20 squared plus 2 a cross times 8
a equals equals negative 25 m s to the power of negative 2 end exponent
F equals m a
F equals 0.8 k g cross times open parentheses negative 25 m s to the power of negative 2 end exponent close parentheses equals negative 20 N
S o space t h e space r e t a r d i n g space f o r c e space i s space 20 N
N e g a t i v e space s i g n space s h o w s space t h a t space t h e space f o r c e space i s space a p p l i e d space i n space o p p o s i t e space d i r e c t i o n.

Answered by Utkarsh Lokhande | 24th Sep, 2019, 12:41: PM