Calculating Vo in Projectile Motion: 800m Distance with 70° Angle in 4 Seconds

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DrkCould
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Homework Statement


An object was lauch at uknow velocity at an angle of 70 degree in the X direction. After 4 second later it land. The distance was 800 meter. Find the Vo of the object. What Vo is compose of?


Homework Equations


t= 4 sec
distance travel= 800
angle= 70


The Attempt at a Solution


x= Vocos(u)T and T= 2VoSin/g
X/(cos(u)*t)= Vo

the twon Vo did not match is there any other way to find the solution
 
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DrkCould said:

Homework Statement


An object was lauch at uknow velocity at an angle of 70 degree in the X direction. After 4 second later it land. The distance was 800 meter. Find the Vo of the object. What Vo is compose of?


Homework Equations


t= 4 sec
distance travel= 800
angle= 70


The Attempt at a Solution


x= Vocos(u)T and T= 2VoSin/g
X/(cos(u)*t)= Vo

the twon Vo did not match is there any other way to find the solution

With the information given the x/(t*Coos70) = Vo is the only one to be trusted, because the g of the top equation may not be on earth.