An ice skater slides in a straight line across the ice. As she passes a certain point, her velocity is 24 km/hr. Two seconds lat
er it is 13 km/hr. What is the acceleration of the skater?
5.5 km/hr/sec
-5.5 km/hr/sec
11 km/hr/sec
-11 km/hr/sec
1 answer:
Acceleration = (change in speed) / (time for the change)
Change in speed = (later speed) - (earlier speed) = (13 - 24) = -11 km/hr
Time for the change = 2 seconds
Acceleration = (-11 km/hr) / (2 sec)
Acceleration = -5.5 km/hr-sec (B)
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