A train is moving along a straight line with a constant acceleration 'a'. A boy standing in the train throws a ball forward with a speed of 10 m/s, at an angle 60 degree to the horizontal. The boy has to move forward by 1.15 m inside the train to catch the ball at initial height. the acceleration of the train is? My doubt is that 'as the train is in accelerated motion wont it create the problem of non inertial frame?