A bullet experiences force F(t)=600−(2×10⁵)t N in a barrel. It leaves when the force becomes zero. Calculate the impulse.

Question

G1 Physics · Accepted Answer

Set 600−2×10⁵t=0, giving exit time 0.003 s. Impulse is the triangular area under the linearly decreasing force graph: I=½×600×0.003=0.9 N s. Answer: D.