- #1
Ofir12
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A child is in danger of drowning in the river. The river has a current of 2.5 km/hr . The child is 0.6 km from the shore. A rescue boat with speed 20.0 km/hr (with respect to the water) ,located 0.8km downstream, sets off from the shore.
What would be the optimum angle (shore -> boat ) to reach the child as fast as possible ?
And how long will it take to the boat to reach him?
I'm not sure if this is the correct way to draw this :
a = 0.6 km
b = 0.8 km
v = 20.0km
u = 2.5km
c = √(a² + b²)
how do I find the angle?
I feel a little bit lost, your help is appriciated.
Thanks.
What would be the optimum angle (shore -> boat ) to reach the child as fast as possible ?
And how long will it take to the boat to reach him?
I'm not sure if this is the correct way to draw this :
The Attempt at a Solution
a = 0.6 km
b = 0.8 km
v = 20.0km
u = 2.5km
c = √(a² + b²)
how do I find the angle?
I feel a little bit lost, your help is appriciated.
Thanks.
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