The problem statement, all variables and given/known data A 1000 kg car strikes a tree at 30 km/hr & comes to a stop in 0.15s. Find its initial momentum and the average force on the car while it is being stopped. Attempt at a solution For velocity, I tried converting 30 km/hr to m/s 30 km/hr * 1hr/3600s*1000m/1km =30000 m/ 3600 s = 8.33 m/s For the momentum... p = mv p = 1000 kg (8.33 m/s) p = 8330 kg * m/s Is this correct? How do I find the average force? Please help me. My teacher says I'm wrong at some equation.