A 40 kg rock is accelerating down a hill at 3 m/s2. What is the net force exerted on the rock
To find the net force exerted on an object, you need to use Newton's second law of motion formula:
F = m * a
Where:
F is the net force (in newtons),
m is the mass of the object (in kilograms),
a is the acceleration (in meters per second squared).
In this case, the mass of the rock is given as 40 kg, and the acceleration down the hill is given as 3 m/s^2. Plugging these values into the formula:
F = 40 kg * 3 m/s^2
F = 120 N
Therefore, the net force exerted on the rock is 120 newtons.