Laws Of Motion Question 281

Question: An object of mass 10 kg moves at a constant speed of10ms1 . A constant force that acts for 4 sec on the object gives it a speed of 2ms1 in opposite direction. The force acting on the object is

Options:

A) -3N

B) -30 N

C) 3N

D) 30 N

Show Answer

Answer:

Correct Answer: B

Solution:

[b] Hereu=10ms1,v=2ms1,t=4s,a=?

Using a=vut=2104=3m/s2

Force, F=ma=10×(3)=30N



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