9120118 Launched horizont Find ally at 25 m/s Erom height of 40 m. A time of Eli

Question

9120118 Launched horizont Find ally at 25 m/s Erom height of 40 m. A time of Elight 2.5 B range C final velocity 3.15 44 T.1 Launched from ground level at 25 m/s 60° above horizontal. Find A time of Elight C final velocity 21000 range %in Launched from height of 40 m at 25 m/s 60 above horizontal-Find A time of flight 582 B range 12.6 @1.55 final velocitys A boat heads directly across a river that flows at 15 km/h. What is the velocity of the boat if it can travel at 20 km/h in still water? 25 KmAh 30.sr® donnon m

Explanation / Answer

1.

Considering motion along vertical

h= 0.5*9.8*t^2

40*2/9.8= t^2

t= 2.857 s

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Range, R= ut= 25*2.857= 71.43 m

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Using conservation of energy

0.5m v^2= mgh + 0.5 mu^2

0.5v^2= 9.8*40+ 0.5* 25^2

v= 37.54 m/s

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2.

Time of flight,

t= 2 u sin x/g= 2* 25* sin 60/9.8= 4.41 second

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Range, R= u^2 sin (2x)/g= 25^2* sin 120/9.8= 55.23 m

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Final velocity,

V= same as initial= 25 m/s

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Plz post other problems seperately.

Comment in case any doubt.. good luck

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