A constant force acting on a body of mass `3 kg` changes its speed from `2ms^(-1)` to `3.5 ms^(-1)` in 25 s. The direction of motion of the body remains unchanged . Calculte magnitutude and direction of the force .

Explanation

Here, ` m = 3.0 kg u = 2.0 ms^(-1),upsilon = 3.5 ms^(-1) , t = 25 s , F = ? `
`F = ma = (m (upsilon - u ) )/(t) = (3.0 ( 3.5 - 2.0))/(25) = 0. 18 N`
The force is along the direction of motion.