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(A) $1$. As the ball rolls down the ramp $AB$,its potential energy is converted into kinetic energy,so its speed increases linearly with time. $2$. On

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(A) $1$. As the ball rolls down the ramp $AB$,its potential energy is converted into kinetic energy,so its speed increases linearly with time. $2$. On the horizontal surface $BC$,there is no force acting along the direction of motion (ignoring friction),so the speed remains constant. $3$. As the ball moves up the ramp $CD$,it gains potential energy at the expense of kinetic energy,so its speed decreases linearly with time. $4$. Finally,on the horizontal plane $DE$,the speed remains constant again at a lower value than on $BC$. $5$. Comparing this behavior with the given graphs,Figure $(1)$ correctly represents this variation: speed increases,stays constant,decreases,and then stays constant at a lower value.

In the picture shown,a ball starting from rest rolls down a ramp $AB$,moves along the horizontal bottom $BC$,then goes up a smaller ramp $CD$,and thereafter rolls on the horizontal plane $DE$. Ignore friction and air resistance. Which of the following figures shows the variation in speed with time?

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