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A hunter is riding an elephant of height 4m moving in straight line with uniform speed of 2m/s. A deer running with a speed V at a distance of (4squaroot5)m moving perpendicular to direction of motion of the elephant. If hunter can throw his spear with a speed 10m/s relative to elephant, then at what angle to its direction of motion must he thrown w.r.t elephant his spear horizontally for a successfull hit. Find also the speed V of deer.

A hunter is riding an elephant of height 4m moving in straight line with uniform speed of 2m/s. A deer running with a speed V at a distance of (4squaroot5)m moving perpendicular to direction of motion of the elephant. If hunter can throw his spear with a speed 10m/s relative to elephant, then at what angle to its direction of motion must he thrown w.r.t elephant his spear horizontally for a successfull hit. Find also the speed V of deer.

Grade:11

2 Answers

Monil Shah
34 Points
10 years ago

Velocity of deer is 50m/s,time taken is 2/5root5, sin theta is 2/3

Cos theta is root5/3

Pravesh Vyas
34 Points
7 years ago
37 degrees and 6m/s

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