Kinematics Question 633

Question: If retardation produced by air resistance of projectile is one-tenth of acceleration due to gravity, the time to reach maximum height

Options:

A) decreases by 11 percent

B) increases by 11 percent

C) decreases by 9 percent

D) increases by 9 percent

Show Answer

Answer:

Correct Answer: C

Solution:

[c] The time to reach the maximum height without air resistance;

t1=ug=u10 , and with air resistance, t2=u10+1=u11

=t1t2t1×100=[u10u11u10]×100

=9



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