Question

An object of mass 1 kg moves with an initial velocity of 20 ms-1. How much force (in N) is required to change the velocity to 30 ms-1 in 1 millisecond?

Answer 1

Mass of the object (m) = 1 kg

Initial velocity with which the object was moving = 20 m/s

Final velocity that will be acquired by the body = 30 m/s

Time interval (t) = 1 millisecond = 0.001 second

Required Force = 1 × ((30-20)/0.001) = 10/0.001 = 10,000 N [Ans.]

Answer 2

Answer:

Explanation:

MASS=1 KG

INITIAL VELOCITY,U=20 M/S

FINAL VELOCITY,V=30 M/S

TIME TAKEN= 1*10^-3 SECONDS

FORCE= MASS* ACCELERATION

BUT ACCELERATION = CHANGE IN VELOCITY/ TIME TAKEN

                                    = (V-U)/T

                                    = (30-20)/10^-3

                                    =10000 M/S²

FORCE= MASS* ACCELERATION

FORCE=1*10000

           = 10^4 N.

HOPE THIS HELPS.