3. A 15.0 kg block is pushed up a 35° incline. The coefficient of friction between the block and the incline is 0.480. What minimum force would be needed to move the block up the incline
at a constant speed? (4 marks)
4. A child pulls an 8.50 kg toboggan across the sidewalk by exerting a 60.0 N force in the
direction shown. The coefficient of friction between the toboggan and sidewalk is
0.520. What is the acceleration of the toboggan? (5 marks)

Which units can be used to measure length or distance? check all that apply. gram meter kilometer liter inch

In which situation has the independent variable for the experiment been changed? check all that apply. changed from counting the number of duckweed at day 0 and day 14 to counting them every day changed from testing duckweed growth in beakers to testing duckweed growth in large outdoor tanks changed from testing the effect of ph on duckweed growth to testing the effect of light levels on duckweed growth changed from testing the effect of acid ph on duckweed growth to testing the effect of basic ph on duckweed growth

Who was the first scientist to measure speed as distance over time?