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Un garcon pousse une tondeuse a gazon (m=17.9kg) initialement au repos sur une pelouse a l'horizontale en appliquant sur les poignees une forces de 32.9N

Un garcon pousse une tondeuse a gazon (m=17.9kg) initialement au repos sur une pelouse a l'horizontale en appliquant sur les poignees une forces de 32.9N dans la direction du manche, lequel forme un angle de 35.1 degree au dessus de l'horizontale. La grandeur de l'acceleration de la tondeuse est de 1.37 m/s^2 et dure 0.58s, apres quoi la tondeuse se deplace a vitesse vectorielle constante. determine la grandeur de :

a) la force normal exercee sur la tondeuse

b) la force de frottement exercee sur la tondeuse

c) la vitesse vectorielle maximale de la tondeuse

d) la force qu'applique le garcon qunand la vitesse vectorielle est constante.

English translation :

A boy pushes a lawn mower (m=17.9kg) initially at rest on a horizontal lawn by applying a force of 32.9N to the handles in the direction of the handle, which forms an angle of 35.1 degree above the 'horizontal. The magnitude of the acceleration of the mower is 1.37 m/s^2 and lasts 0.58s, after which the mower moves at constant vector speed. determine the magnitude of:

a) the normal force exerted on the mower

b) the frictional force exerted on the mower

c) the maximum vector speed of the mower

d) the force applied by the boy when the vector speed is constant.

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