A bus is moving rightward with a velocity of `15m//sec` and on the bus a monkey is renning oppositely with a velocity of `5m//sec(` with respect to the bus `)`. Nearby a helicopter is rising vertically up with a velocity of `10m//sec.`

Find out the direction of the helicopter as seen by the monkey.

Answer

`uarr`

Explanation

`vec(V)_(hM)=vec(V)_(h)-vec(V)_(M)=10j-10i=-10i+10j`
`:.vec(V)_(hM)=10(-i)+10j, :. ` As seen any the monkey helicopter is moving in direction.

`vec(V)_(Bh)=vec(V)_(B)-vec(V)_(h)=15i-10j=15i+10(j)`

`:. ` seen by helicopter's pilot the bus is moving in direction.