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Grade: 11
```
a man walking steadily on a horizontal ground with a speed 2 km/hr finds that the rain falls vertically on him.if he doubles his speed rain seems to fall at 45 degree to vertical from front side. find at what direction and speed the rain would strike him if he stops??
a man walking steadily on a horizontal ground with a speed 2 km/hr finds that the rain falls vertically on him.if he doubles his speed rain seems to fall at 45 degree to vertical from front side. find at what direction and speed the rain would strike him if he stops??

```
6 years ago

## Answers : (1)

Arun Kumar
IIT Delhi
askIITians Faculty
256 Points
```							Hi Nivetha,$let\\v_{rain,gnd}=x\vec i+y\vec j \\v_{man}=2\vec i \\v_{rain,man}=x\vec i+y\vec j-2\vec i$only vertical component exist meansx=2$\\v_{rain,man}=2\vec i+y\vec j-4\vec i \\=-2\vec i+y\vec j$Since it makes an angle 45 degrees$y=\pm 2$If we take 135 degree too as 45 degree to normal$v_{rain}=2\vec i\pm2\vec j$Thanks & Regards
Arun Kumar
Btech,IIT Delhi
Askiitians Faculty
```
6 years ago
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