CBSE Class 9 Answered
a truck of mass 5000kg traveling at 40m/s is brought to rest by applying its brakes. the truck comes to rest after traveling 20m after application of brakes. what is the kinetic energy of the truck?
Asked by | 28 Dec, 2011, 12:00: AM
Expert Answer
Here v=0 m/s and u= 40m/s
S= 20 m
V2-u2= 2as
-(20)2 =2x20a
-400/40=a
-10m/s2= a
K.E= ½ m v2
=1/2x 5000x40 x40 = 5000x20x40 = 4x 106J
Answered by | 29 Dec, 2011, 12:49: PM
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