Question

A body of mass 5 kg started from rest moves with an accelration 4ms its momentum after 5s

Answer 1

$m = 5kg \\ a = 4m {s}^{ - 1} \\ u = 0m {s}^{ - 1} \\ t = 5s \\ a = \frac{(v - u)}{t} \\ 4 = \frac{v - 0}{5} \\ 4 \times 5 = v \\ v = 20m {s }^{ - 1} \\ \\ \\ \\ p = mv \\ \: \: \: \: = 5 \times 20 \\ \: \: \: \: = 100kg.m {s}^{ - 1}$
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Answer 2

mass = 5 kg

initial velocity (u)= o

time = 5s

acceleration = 4ms

From first equation of motion

v = u+ at

v = o + 4 × 5

v = 20 m per s

momentum = Mass × velocity

= 5 × 20

= 100 kg m / s