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ICSE Class 7 Answered

2 objects are moving at 120m/s in opposite directions. Are their velocities the same? Give reason
Asked by amulyavraghavan | 23 Sep, 2018, 11:14: AM
Expert Answer
The velocity of a body with respect to another moving body is called relative velocity.
 
If two bodies (1) and (2) are moving in the same direction with constant velocities v1 and v2 ,
 
the relative velocity of (1) with respect to (2) is v12=v1- v2.
 
The relative velocity of (2) with respect to (1) is v2 - v1.
 
If v2 moves opposite to v1,

then relative velocity of (1) with respect to (2) is v1 - (-v2) = v2 + v1. 

i.e. v12=v1 +v2
Answered by Abhijeet Mishra | 24 Sep, 2018, 12:45: PM
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