Answer Happy

Please help with calculation steps
Activity 4: Predict the time for a steel sphere to roll down an incline. A Length of Track (cm) (s) (Step 1, use 80 cm) B Angle of Elevation (0) in Degrees (Step 1) C Calculated Time from s=0 to s=80 (formula from step 2) D Measured Time from s=0 to s=80 (step 3 with stopwatch) % Difference (step 4) E percent difference = first value - second value first value + second value 2 0 x 100% Steel Sphere 80 cm Acrylic Sphere 80 cm Question for Activity 4: What effect does the type of the sphere have on the time of the object to travel the measured distance, explain?