Posted by Michelle on Sunday, January 24, 2010 at 5:54am.
a) They have told you that the rain is falling vertically. Call its vertical velocity Vy. In the reference frame of the car, the rain also has a horizontal component of Vx = 35 km/h and a vertical component Vy. Because of the 40 degree tracks of the drops,
Vx/Vy = tan 40 = 0.839
Vy = 1.19*Vx = 41.7 km/h
Magnitude of velocity = sqrt (Vx^2 + Vy^2) = 54.5 km/h
b) In the earth references frame, the only velocity componenet is the vertical one, Vx, which is the same as in part (a)
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