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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 later it is 13 km/hr. What is the acceleration of the skater? 5.5 km/hr/sec
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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 later 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

User Bompf
by
7.9k points

2 Answers

2 votes

Answer:

Option (b) -5.5km/sec

Step-by-step explanation:

User Guern
by
8.3k points
6 votes
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)
User Shahrear Bin Amin
by
8.1k points
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