The answer would be stay because the surface is flat so it will stay!
They all have segmented limbs, a hard exoskeleton, a pair of antennae and a segmented body.
The maximum force acts between B and C as the graph is steepest showing maximum deceleration
Explanation:
Momentum before = momentum after
m₁ u₁ + m₂ u₂ = m₁ v₁ + m₂ v₂
(65 kg) (0 m/s) + m (0 m/s) = (65 kg) (-3.5 m/s) + m (4 m/s)
m ≈ 57 kg