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Final Exam - Google Chrome a Secure | https/roclms.iwcc.edu/mod/quiz/attempt.php?attempt-11320308&cmid-93; O e. Air molecules between the trumpet and your ear vibrate back and forth parallel to the direction the waves are traveling Question 3 Not yet answered Marked out of 4.00 P Flag question In one of the PHY210 lab experiments, let's say a cart moves horizontally with a constant acceleration across the table. At time t = 0 s, the cart is at x = 0 m. In which case of these combinations of initial velocity and acceleration will the cart be at x =-1.5 m at time t = 3 s? Select one: -b, yet2 m/s, a = +2 m/s d. Vo 2 m/s, a 2 m/s 4 Time left 1:02:56

Explanation / Answer

given the cart moves horizontally across the table

at t= 0 s

x = 0 m ( postion of cart)

at x = -1.5 m

t = 3 s

a. vo = 1 m/s

a = -1m/s

x = vo*t + 0.5at^2 = 3 - 0.5*9 = 3 - 4.5 = -1.5 m

b. vo = 2 m/s

a = 2 m/s

this object will never go for x < 0 hence not possible

c. vo = -2 m/s

a = 2 m/s

x = -2*3 + 0.5*2*9 = -6 + 9 = 3

hecne ot possible

d. vo = -2 m/s

a = -2 m/s/s

x = -2*3 - 0.5*2*9 = -6 - 9 = -15 m

not possible

e. vo = -2 m/s

a = -2 m/s/s

x = 2*3 - 0.5*2*9 = -3 m

not possible

hence option a. is the answer

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