(a)[2]
State the momentum conservation principle.
(b)
The firework is at rest initially. It explodes into three fragments A, B and C, which travel in a horizontal plane, as shown in Fig. 3.1.
(b(i))[3]
Calculate the value of the angle $\theta$.
(b(ii))[2]
Calculate the speed $v$.
(c(i))[1]
Show that the firework’s total chemical energy is $3.5\,\text{J}$.
(c(ii))[3]
Calculate the mass $m$.