Describe an experiment to measure the acceleration of an object down a slope

With the following equipment: two light gates timer trolley carrying a mask (piece of card) of a known length Set up apparatus so the trolley runs down the slope and the mask on the trolley cuts the beams of both light gates. take the measurements: length of mask, time to cut first light gate, time between light gates, time to cut second light gate Calculate initial and final velocity and sub into the formula a=v-u/t