Martin gathered a toy car, a ramp, a stopwatch, a meter stick, and a variety of weights. What is he likely testing
{"Image DocumentName": "Martin gathered a toy car, a ramp, a stopwatch, a meter stick, and a variety of weights. What is he likely testing?", "Image ImageDescription": "A how the angle of a ramp affects the speed of the car B how friction affects the speed of the car C how equal forces work on the placement of the car and the ramp D how mass affects the speed of the car.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}