Question

The magnitude of impulse developed by a mass of 0.2 kg which changes its velocity from 5î-3j+7k m/s to 2î+3j+k m/s is

Answer 1

subtracting the two to get change in velocity =(2-5) i +(3-(-3))j +(1-7)k = -3 i +6j -6k
now magnitude of change in velocity =root (9 + 36 + 36 ) = root (81)=9
now magnitude of impulse =9×0.2 =1.8 newton

Answer 2

subtracting the two to get change in velocity =(2-5) i +(3-(-3))j +(1-7)k = -3 i +6j -6k

now magnitude of change in velocity =root (9 + 36 + 36 ) = root (81)=9

now magnitude of impulse =9×0.2 =1.8 newton

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