Q15 / 72 · NTA Abhyas (JEE Main) 2020 · Physics · Motion In Two Dimensions

A car A is moving with speed 40 km h-1 along a straight line 30° north of east and another car B is moving with same speed along a straight line 30° south of east. The relative velocity of car A as observed from the car B is

  • A
    40 km h-1 north-east
  • B
    40 km h-1 south
  • Correct answer
    C
    40 km h-1 north
  • D
    40 km h-1 south-east

Solution

Figure

V→A=40cos⁡30o i^+20j^

V→B=40cos⁡30o i^-20j^

∴V→AB=V→A-V→B=40j^

The relative velocity of car A as observed from car B is 40 km h-1 north

Hence, the correct answer is option: 'C'.

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