Illustrate the "time of flight" method of measuring the speed of light. (b) how do we determine the speed of light with this method?

120 N

Explanation:

From the question given above, the following data were obtained:

Angle (θ) = 35°

Mass (m) = 15 Kg

Acceleration due to gravity (g) = 9.8 m/s²

Normal force (N) =?

The normal force acting on the object can be obtained as:

N = mg × Cosθ

N = 15 × 9.8 × Cos 35

N= 147 × 0.8192

N = 120 N

Therefore, the normal force acting on the object is 120 N