Question

A constant retarding force of 50 newtons is applied to a body of mass 20 kg moving initial speed of 20 m per second what is the retardation generated in the body

Answer 1

m = 20 kg
F = -50 N
u = 20 m/s
v= 0

F= ma

-50/20= a

a= -2.5 m/s^2

S= v^2-u^2/2a

S= 400/5= 80 m

Answer 2

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Retarding force,

F = –50 N

Mass of the body,

m = 20 kg

Initial velocity of the body,

u = 20 m/s

Final velocity of the body,

v = 0

Using Newton’s second law of motion, the acceleration (a) produced in the body can be calculated as:

F = ma

=> –50 = 20 × a

=> a= -50/20 = -2.5 m/s^2

Using the first equation of motion, the time (t) taken by the body to come to rest can be calculated as:

v = u + at

=> t= -u/a = -20/-2.5= 8 sec.

I hope, this will help you

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