A lorry and a car moving with same kinetic energy are stopped by applying breaks which provides same retardation which one of them will com to rest in shorter distance explain b) if the kinetic energy of a body is double what is the percentage change in linear momentum
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Explanation:
the car will come to rest first
BECAUSE newtons first law of motion says that more the MASS ,longer the
body will stay in that state of motion(what we call INERTIA).
p=(2m*ke)^1/2==ke doubled
new p=(4m*ke)^1/2
so change(root 2 is 1.4 and root 4 is 2)
= 2 root mke -1.4*root mke/1.4mke *100
0.6/1.4*100
42.8 ==== nearly 43% change in momentum
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