A particle moving at a velocity of 2.3 m in the positive x direction is given an acceleration of 4.9 m/s^2 in the positive y direction for 4.3s. What is the speed of the particle? Answer in units of m/s.

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If force (mass x acceleration) is acting perpendicular to the motion of direction of an object, then the work done on the system is constant, which implies that the kinetic energy and hence speed is constant. A common case when acceleration is perpendicular to velocity is during circular motion, which is associated with constant speed. Hence the speed of the particle will be 2.3m/s only.

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