1) If a ball is thrown downward in the absence of air resistance, what can be sa
ID: 1955894 • Letter: 1
Question
1) If a ball is thrown downward in the absence of air resistance, what can be said about its acceleration?A) its acceleration is constantly increasing
B) its acceleration is constantly decreasing
C) its acceleration is constant
D) its acceleration is zero
2 ) A 4.0 kg mass has a velocity of 10 m/s to the EAST. The 4.0 kg mass undergoes an acceleration of 4.0 m/s2 to the WEST for 3.0 sec. What is the velocity of the 4.0 kg mass at the end of the 3.0 sec interval?
A) 22 m/s to the WEST
B) 2.0 m/s to the WEST
C) 0.0 m/s
D) 2.0 m/s to the EAST
E) 22 m/s to the EAST
Explanation / Answer
1. C. It's acceleration is constant (the velocity is increasing because of gravity) 2. B. 2.0 m/s to the WEST vf = vi + at vf = 10 m/s + (-4.0 m/s2)*3.0 s vf = 10 m/s - 12.0 m/s = -2 m/s
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.