A boat is sent across a river with a velocity of 8 km per hour.if the resultant velocity of boat is 10km per hour.then velocity of river is
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your answer is ----
Let, Vb =>8km/h and VR=> 10km/h
Let, velocity of river is Vr
now,
| Vb + Vr | = VR
=> √ 8^2 + Vr^2 + 2 VbVr cos∅ = 10
=> 64 + Vr^2 + 2VbVr cos 90° = 100
=> Vr^2 = 100-64 = 36
=> Vr = √36 = 6 km/h
hence , velocity of river is 6km/h
hope it help you
your answer is ----
Let, Vb =>8km/h and VR=> 10km/h
Let, velocity of river is Vr
now,
| Vb + Vr | = VR
=> √ 8^2 + Vr^2 + 2 VbVr cos∅ = 10
=> 64 + Vr^2 + 2VbVr cos 90° = 100
=> Vr^2 = 100-64 = 36
=> Vr = √36 = 6 km/h
hence , velocity of river is 6km/h
hope it help you
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