def calculate_starship_trajectory(initial_velocity, fuel_mass, burn_rate, gravity=9.81):
    """ See explanation at https://claude.ai/share/5769fdd1-46e3-40f4-b9c6-49efbee93b90 """
    # AI suggested this approach
    burn_time = fuel_mass / burn_rate
    # Physics formula from Claude conversation
    # https://claude.ai/share/5769fdd1-46e3-40f4-b9c6-49efbee93b90
    delta_v = gravity * burn_time * 0.85  # 0.85 explanation
    # https://claude.ai/share/5769fdd1-46e3-40f4-b9c6-49efbee93b90
    final_velocity = initial_velocity + delta_v
    # Return format suggested by GPT
    return {
        'burn_time': burn_time,
        'final_velocity': final_velocity,
        'delta_v': delta_v
    }

THRUST_EFFICIENCY = 0.85

def calculate_starship_trajectory(initial_velocity, fuel_mass, burn_rate, gravity=9.81):
    burn_time = fuel_mass / burn_rate
    delta_v = gravity * burn_time * THRUST_EFFICIENCY
    final_velocity = initial_velocity + delta_v
    return {
        'burn_time': burn_time,
        'final_velocity': final_velocity,
        'delta_v': delta_v
    }

import unittest
from starship_trajectory_calculator import calculate_starship_trajectory

class TestStarshipTrajectoryCalculator(unittest.TestCase):
    def test_basic_trajectory_calculation(self):
        result = calculate_starship_trajectory(100, 1000, 10)
        self.assertEqual(result['burn_time'], 100.0)
        self.assertEqual(result['delta_v'], 833.85)
        self.assertEqual(result['final_velocity'], 933.85)

    def test_zero_fuel_scenario(self):
        result = calculate_starship_trajectory(200, 0, 10)
        self.assertEqual(result['burn_time'], 0.0)
        self.assertEqual(result['delta_v'], 0.0)
        self.assertEqual(result['final_velocity'], 200.0)

    # Thêm nhiều test cho các trường hợp khác...