What force is required to accelerted a lawnmower of mass 12kg to 4.5km/h from rest in 3.0s (neglecting friction)

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Here are some steps to help you solve this one.

1. Convert from km/hr to m/s
2. Solve for acceleration
3. Solve for the force using Force = mass x acceleration
4. Be sure to use the correct units

Let me know what you come up with!