Question

A man moves on a horizontal road towards east at
a speed of 1 km/hr and the rain appears to him
vertical at a speed of 2 km/hr. The actual speed of
the rain (in km/hr) is
(a) 1
(b) root 2
(c) root 3
(d) root 5.​

Answer 1

Answer:

d) root 5

Explanation:

speed of man=î

apparent speed of rain=-2j= actual speed of rain-speed of man

actual speed of rain = -2j+î

=✓1²+(-2)²

=✓5