A 1.00 kilogram object goes through to two-phase motion. In Phase One, it starts

Question

A 1.00 kilogram object goes through to two-phase motion. In Phase One, it starts from rest on a frictionless Surface when you push on it with a force of 3.00 Newtons for 2.00 seconds. In Phase 2, you can can you to push with the same Force but now there is a friction force that pushes in the opposite direction. With this friction Force, the object continues to move forward for an additional 22.5 meters where it has a velocity of 9.00 m/s. Find the acceleration during each phase and the magnitude of the friction force in Phase 2.

1 A 100 kg obrel gues thruugh a twa plu n phase it stats dium rest on a friction less surface when you push on with a of 3 N for 200 In phase 2, yuu sh with the on force that push ies move forward for an opposta dacelier with friction durcu, the objevu Find the neceleracion during each additiunal 22.5 tu where il bas a waloeily phase and the mapmitude urthe fritioa iu

Explanation / Answer

1st phase,

A1=F1/m = 3.00/1.00 = 3.00 m/s^2

2nd phase,

By Kinematic eqn,

vf^2=vi^2+2*a*d

9.0^2 = 0^2 +2*a*22.5

a2= 1.8 m/s^2

Fnet = m*a2 = 1.00*1.8 = 1.8 N

Fnet = F2 - Ff

Ff = F2 – Fnet

Plugging values,

Ff = 3.00 – 1.8 = 1.2 N

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