# In order to gain velocity of 12 m/s , how long should a force of 30 N be exerted on a body of mass 5 kg ?

2

2015-02-22T20:51:09+05:30

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Force = mass * acceleration   by Newton's law.

acceleration a = 30 N / 5 kg = 6 m/s²

final velocity = v,      initial velocity = u,        time duration = t
we know from equations of dynamics/kinematics:
v = u + a t
t = (v - u) / a = 12 / 6 = 2  seconds.

2015-02-22T20:51:42+05:30

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Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
force = 30N
mass = 5kg
change in velocity = 12m/s
t = ?
force = mass * change in velocity / time
t =  mass * change in velocity/ force
= 5 * 12 / 30 = 2 seconds