Unformatted text preview: one lauched at 45 d. the one lauched at 60 … its horizontal velocity changes … its acceleration changes … its vertical velocity is zero … it stops accelerating Question 10 – The builders of the pyramids used a long ramp to lift 30,000 kg blocks. Traveling at constant velocity, a block rose 2 m in height while traveling 3 0 m along the ramp’s surface. How much uphill force was needed to push it up the ramp? a.
d. 20,000 N 590,000 N 3,100 N 60,000 N r
Question 11 – As you jump across a small stream, does a hor izontal force keep you moving forward? a.
d. yes, but because of your inertia this force gradually e xpires yes, there is a horizontal force: your weight no, because your horizontal acceleration is constant no, there is no horizontal force PHYS115 ‐ Spring 2013 5 Test 1 ‐ 4 March 2013 Question 12 – A gymnast jumps upward with an initial speed of 10 m/s. For this question, use g = 10 m/s2. She is in the air for a total time of … a. … 1 s b. … 2 s c. … 5 s d....
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