Question

An object with a mass of 100 kg changes its velocity from 90 kmph in to 72 kmph in 20 seconds. Calculate force acting on the object.

Answer 1

Answer:

The force acting on the object = 1.5625 N

• Force = mass * acceleration

            = mass * (change in velocity per second)

• Given ,  

Initial velocity = 90 Km/h = 25 m/s

Final velocity = 72 Km/h = 20 m/s

Time = 320 s

• Acceleration = (20 – 25) / 320

                      =  -0.015625 m/s2  

Force = 100 * ( -0.015625 m/s2 )

          = - 1.5625 N

• It is a retarding force of 1.5625 N

Explanation:

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Answer 2

Answer:

Explanation:

MASS , M = 100 KG

INITIAL VELOCITY , U = 90 KM / H     [ TO CONVERT KM/H TO M/S

                                     = 90*5/18                   MULTIPLY BY 5/18]

                                     = 25 M/S          [ TO CONVERT M/S TO KM/H

FINAL VELOCITY , V = 72 KM/ H                   MULTIPLY BY 18/5]

                                   = 72*5/18                      

                                   = 20 M/S

TIME TAKEN = 20 SEC

FORCE = MASS * ACCELERATION                   ACCELERATION = (V-U)/T

FORCE = MASS * (V-U)/T

FORCE = 100*( 20-25)/20

FORCE = - 25 N.

THEREFORE RETARDING FORCE ACTING ON THE BODY IS

25 N

HOPE THIS HELPS.