Kinematics Question 632

Question: You throw a ball with a v=(3i^+4j^)m/s towards a wall, where it his at height h1 . Suppose that the launch velocity were, instead, v=(5i^+4j^)m/s and h2 it’s height, then

Options:

A) h1=h2

B) h2h1

C) $ {{\text{h}} _{\text{2}}}\text{}{{h _{1}} $

D)h2h1

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Answer:

Correct Answer: B

Solution:

[b] x=3t1=5t2t1=x/3 and t2=x/5

Now h1=4t112gt12=43xgx218.

and h2=4t212gt22=4x5gx210.

Clearly, h2<h1.



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