When a force of constant magnitude always act perpendicular to the motion of a particle then why is 1)the velocity - Science - Force and Laws of Motion

Question

When a force of constant magnitude always act perpendicular to the
motion of a particle then why is 1)the velocity not constant
2)acceleration not constant 3)KE is constant

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When a force of constant magnitude always act perpendicular to the motion of a particle then why is 1)the velocity not constant 2)acceleration not constant 3)KE is constant