9702 June 2015 Paper 21 Worked Solutions | A-Level Physics
Question 2 - See solution 1026 at
Define speed and velocity and use these definitions to explain why one of these quantities is a scalar and the other is a vector.
Question 3
Two balls X and Y are supported by long strings, as shown in Fig. 3.1. The balls are each pulled back and pushed towards each other.
Speed is the distance covered per unit time so only has a magnitude and unit whereas displacement is the distance covered in a particular direction per unit time so has a magnitude, direction and unit.
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