Three particles P, Q and R are placed as per given figure. Masses of P, Q and R are 
m, 
m and m respectively. The gravitational force on a fourth particle ‘S’ of mass m is equal to
A
in ST direction only
B
in SQ direction and 
in SU direction
C
in SQ direction only
D
in SQ direction and 
in ST direction
Text Solution
Verified by ExpertsThe correct answer is:
C
In horizontal direction
Net force = 
cos30° – 
cos60°
= 
– 
= 0
in vertical direction
Net force = 
cos 60° + 
+ 
cos30°
= 
+ 
+ 
= 
= 
along SQ
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