Question

a boy is moving east with a relocity 69m/min.The rain is falling vertically with a velocity of 250/min. At what angle and with what velocityrain appears to fall on the boy?​

Answer 1

Answer:

10m s

20m s

Explanation:

A standing man observes rain falling vertically with a velocity 20m/s at an angle 30degree with the vertical?

1.Find the velocity with which the man should mode so that rain appears to fall vertically to him.

2. Now if he further increases his speed rainagain appears to fall at 30degree with the vertical.Find his new velocity.

Rain falling vertically with a velocity 20m/s at an angle 30° with the vertical

Rain Horizontal Speed = 20Sin30° = 20 * 1/2 = 10 m/s

he velocity with which the man should mode so that rain appears to fall vertically to him = 10 m/s  in the direction of angle of Rain

if he further increases his speed rain again appears to fall at 30°

but in opposite

=> Horizontal Speed of Rain appearing = 20Sin(-30) = -10 m/s

Actual Horizontal Speed of Rain = 10 m/s

=> Man Speed = 10-(-10)  = 20 m/s