Question

Rain is falling with speed 12/2 m/s
at an angle of 45° with vertical line.
A man in a glider is going at a
speed of 'V' at angle of 37º with
horizontal with respect to ground
Find the speed (in m/s) of glider so
that rain appears to him falling
vertically. Consider motion of glider
and rain drops in same vertical
plane
WY
Rain​

Answer 1

Answer:

ANSWER

Convert the velocity vectors into horizontal and vertical components.

So the velocity of rain wrt ground, v

RG

=12

2

.

The horizontal component will be v

RG

Cos45, i.e. 12 in positive x direction.

Vertical component will also be 12m/s in negative y direction.

Now,

Velocity of man with respect to ground, v.

Horizontal component of v will be

5

4v

in negative x direction, vertical component will be

5

3v

in negative x direction.

By equation

v

RM

+v

MG

=vRG

For rain to appear falling only in vertical plane to the man, velocity of rain in the horizontal plane must be zero to the man,i.e. v

RM

=0 in horizontal plane.

Now consider equation * for horizontal motion,

0+v

MG,X

=v

RG,X

v

MG,X

=

5

4v

So,

5

4v

=12

Hence, v=15m/s.

Answer 2

Answer:

The answer is a option A