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Sahay Sir > Question Answers > NCERT Exemplar Class 11 > Physics > Chapter 4 - Laws of Motion > A constant force acting on a body of mass 3.0 kg changes its speed from 2.0m s^−1 to 3.5m s^ −1 in 25s. The direction of the motion of the body remains unchanged. What is the magnitude and direction of the force?

A constant force acting on a body of mass 3.0 kg changes its speed from 2.0m s^−1 to 3.5m s^ −1 in 25s. The direction of the motion of the body remains unchanged. What is the magnitude and direction of the force?

(a) during its upward motion (b) during its downward motion (c) at the highest point where it is momentarily at rest. Do your answers change if the pebble was thrown at an angle of 45 degree with the horizontal direction? Ignore air resistance. A pebble of mass 0.05 kg is thrown vertically upwards. Give the direction and magnitude of the net force on the pebble