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09-04-2014
Physics

contestada

A skateboarder has an acceleration of -1.9 m/s2. If her initial speed is 6 m/s how long does it take her to stop?
A. 4.1s
B. 3.2s
C. 0.32s
D. 2.1s

Respuesta :

Shashank Shashank

10-04-2014

intial speed = 6m/s
final speed = 0 m/s as it stop
acceleration = 1.9 m/s2
time taken = t s

v=u+at
0=6+1.9*t
t=3.15 s = 3.2 s

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