Question

The force 10 N acting on an object of mass 60 kg increases its velocity from its state of rest. What is its velocity after 30 s?

Answer 1

Answer:

Mass of the body, m = 3 kg

Initial speed of the body, u = 2 m/s

Final speed of the body, v = 3.5 m/s

Time, t = 25 s

Using the first equation of motion, the acceleration (a) produced in the body can be calculated as:

v=u+at

a=t(v−u)

   =25(3.5−2)=0.06m/s2

As per Newton's second law of motion, force is given as:

F=ma

    =3×0.06=0.18N

Since the application of force does not change the direction of the body, the net force acting on the body is in the direction of its motion.