Acyclist leaves home and rides due east for a distance of 45 km. she returns home on the same bike path. if the entire trip takes 4 hrs, what is her average speed? what is her displacement ?

The average speed is 22.5 km/hr and displacement is zero.

Explanation:

Given that,

Distance of one side = 45 km

Time = 4 hrs

We need to calculate the average speed

Using formula of average speed

Where, D = total distance

T = total time

Put the value into the formula

Displacement will be zero because the journey ends where the journey stated.

Hence, The average speed is 22.5 km/hr and displacement is zero

5 w for 1hr = 5x60x60 joules=300x60=3000x6=18,000j as total energy conversion. efficiency of bulb needed for radiant to thermal within 18000