First slide

Relative motion in 2 dimension

Question

Wind is blowing in the north direction at speed of 2 m/s which causes the rain to fall at some angle with the vertical. With what velocity should a cyclist drive so that
the rain appears vertical to him?

Moderate

A

2 m/s south
B

2 m/s north
C

4 m/s west
D

4 m/s south

Solution

Horizontal component of rain's velocity will be equal to velocity of wind which is 2 m/s in north direction. If cyclist goes towards north with velocity 2 m/s, then w.r.t. him rain's horizontal component of velocity will be zero, and he will See only vertical component.

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