Question

14. What force would required to accelerate a
body of mass 20kg from 1.5m/s to 9m/s in one third of a minute.?​

Answer 1

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Here to Find manitude of force , we need accerlation and mass of the body as -:

Force (f) = mass(m) x accerlation(a)

Now,

Mass of body (m) = 3 kg

Initial speed (u) = 20 m/s

Final speed (v) = 45 m/s

Time taken (t) = 25 sec.

To find accerlation of body , use the Newton's first equation of uniform motion-

v= u + at

Put values in the equations,

45 = 20 + a (25)

25 = a (25)

a = 1 m/s²

Put the values of m and a in equation to get magnitude of force acting on the bo,

F = 3 x 1 = 3 newton