Recent content by lina45

howcome the formula s = \frac{}{}1/2 at^{}2 used instead of s = ut + \frac{}{}1/2 at^{}2

but wouldn't the net force be zero because when you use the formula F = ma isn't constant deceleration regarded as zero acceleration?

Homework Statement Q : A train of mass 8.0 \times 10^{}6 kg, traveling at a speed of 30 m s^{}-1, brakes and comes to rest with a constant deceleration in 25s. (a) Calculate the frictional force acting on the train while decelerating. (b) Calculate the stopping distance of the train...