WQ6.19 4/4 points (graded) A mass m is pulled along a rough table at constant velocity, with a non-zero external force Fest- Fext N Fext Ffric mg The magnitudes of the forces on the free-body diagram have not been drawn carefully, but the directions are correct. a) The magnitude of the horizontal component of Fear must be the friction force. O larger than smaller than the same as b) The vertical component of Fest must be Fezt, y = N - mg O Fert, y = N + mg Fert, y = - N +mg O Fert, v = 0 O Fest, y = N c) Assuming that the coefficient of kinetic friction (4 ('mu'), mass m and angle 0 between the external force and the horizontal direction are known, write an equation that you could use to calculate the magnitude of the external force. m*g/(cos(theta)*(1/mu)+sin(theta)) V mvg cos(8).(+)+sin(8) d) Does your equation make sense in the limit of 0 -> 0? Explain. yes