A stationary shell of mass 2.0 kg explodes into three fragments of masses 0.8 kg, 0.7 kg and 0.5 kg. The 0.8 kg fragment moves along the +x-axis at 3 m/s, and the 0.7 kg fragment moves along the +y-axis at 4 m/s. Find the speed of the 0.5 kg fragment.
a) 6.3ms−1
b) 10.4ms−1
c) 7.4ms−1
d) 5.0ms−1