Question

Starting from a stationary position, Anil bicycles his cycle to attain a velocity of 10m/s in 25s. And then he applies brakes in such a way that he again comes to rest after next 50s. Calculate the acceleration in both the cases and also find total distance

Answer 1

Initial velocity given is zero. The final velocity 10 M per second is attained in 25 seconds. Using the equation v= u + at where v is final velocity ,u is initial velocity, a is acceleration and t time. Substituting the values we get a=0.4m/s^2. Now for the second case the initial velocity is 10 M per second and the final velocity is zero. Using the same equation we get a=(-0.2) m/s^2. Displacement for the first case is given by v^2-u^2=2as. Substituting we get, 125m. For the second case, 250m and mind the sign convention. Both are positive. The total displacement will then be 375m