CBSE Class 11-science Answered
v = velocity = dx/dt = 10t + 20
where dx/dt = differentiation of position function i.e. x(t) w r t time.
a = acceleration = dv/dt = 10 m/s2 (Note that it's constant and doesn't depend on time)
velocity at t = 2 s,
v = 10 x 2 + 20 = 40 m/s
Hence momentum, p = mv = (2 kg)(40 m/s) = 80 kg.m/s
Force = ma = (2 kg)(10 m/s2) = 20 N
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