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CBSE Class 11-science Answered

pls help
Asked by | 01 Aug, 2009, 04:29: PM
Expert Answer

 

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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