Final answer:
The momentum of an 1800 kg plane moving at 85 m/s is 153,000 kg·m/s, calculated by multiplying the plane's mass by its velocity.
Step-by-step explanation:
The momentum of an object is defined as the product of its mass and velocity. For an 1800 kg plane gliding across the sky at 85 m/s, The momentum of an object is given by the product of its mass and velocity. In this case, the mass of the plane is 1800 kg and its velocity is 85 m/s. we calculate the momentum by multiplying the mass (1800 kg) by the velocity (85 m/s), which gives us:
Momentum = mass × velocity
Momentum = 1800 kg × 85 m/s = 153,000 kg·m/s
Therefore, the plane's momentum is 153,000 kg·m/s.