(a) a car speedometer has a 5.0% uncertainty. what is the range of possible speeds when it reads 90km/h? (b) convert this range to miles per hour. (1 km=0.6214 mi)

(a). 90±45 km/hr

(b). 55.926 ± 2.7963 mil/hr

Explanation:

Given that,

Uncertainty = 5.0%

Here, A = 90 km/h

(a). We need to calculate the range of speed

We need to calculate the error of 5.0% uncertainty

Here, = uncertainty

(b). We need to convert this range to miles per hour

1 km = 0.6214 mil

Hence, This is the required solution.

we need to know the time interval during which the force acts. impulse of force = momentum change