Question

A particle of mass 0.2kg is moving in one dimension under a force that delivers a constant power 0.5 W to the particle. If the initial speed of the particle is 0 . Find the speed after 5s.

Answer 1

P= F*v = ma*v

=m(v-u/t)*v (u=0+

=m(v/t)*t = m*(v^2)/t

v^2=P*t/m = 0.5*5/0.2

v^2= 25/2

v=5/√2 = 3.5m/s

Answer 2

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