Laws Of Motion Question 259

Question: A body of mass 5 kg starts from the origin with an initial velocity u=30i^+40j^ms1 . If a constant force F=(i^+5j^)N acts on the body, the time in which the y?component of the velocity becomes zero is [EAMCET (Med.) 2000]

Options:

A) 5 seconds

B) 20 seconds

C) 40 seconds

D) 80 seconds

Show Answer

Answer:

Correct Answer: C

Solution:

uy=40m/s , Fy=5N , m=5kg .

So ay=Fym=1m/s2

(As v=u+at ) \ vy=401×t=0

therefore t=40sec .



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