Projectile Motion problem

1. Jul 28, 2014

Vibhor

1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

Maximum height attained by first projectile H = u2sin2θ/2g = 15m

If acceleration vector is assumed a = axi+ayj , then at H √(ax2+ay2) = 50 .

Now I need to use the given conditions to come up with another equation . Not sure how to proceed .

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Last edited: Jul 28, 2014
2. Jul 28, 2014

Staff: Mentor

3. Jul 28, 2014

Vibhor

Please see if it is viewable now .

4. Jul 28, 2014

Vibhor

Could somebody help me with the problem .

5. Jul 29, 2014

Staff: Mentor

Figure out the centripetal acceleration at that point. Hint: Use the fact that the first projectile is at its apex at the point H.

6. Jul 29, 2014

Vibhor

Hi Doc

Your suggestion has worked nicely .Thanks a lot .

I was just wondering what do we infer from the third line in the problem " such that the speed is increasing continuously ". We didn't make any use of it .

7. Jul 29, 2014

Staff: Mentor

You make use of that fact in determining the direction of the horizontal acceleration component. It tells you that ax is positive.

8. Jul 29, 2014

Vibhor

Thank you very much .