Problem a 900kn spaceship comes in for a vertical landing, Ask an Expert

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Problem: A 90.0kN spaceship comes in for a vertical landing. From an initial speed of 1.00 km/s, it comes to rest in 1.50min with uniform acceleration.

Part I: What braking force must its rockets provide? Ignore air resistance.

I need help to find what braking force must its rockets provide.

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