2- A car spends two hours driving at 20 km/h, and then an hour driving at 50 km/h. What is the average speed of the car?
A. 50 km/h
B. 45 km/h
C. 35 km/h
D. 30 km/h
Please I need the answer of this

The 5-kg cylinder is initially at rest when it is placed in contact with the wall b and the rotor at a. if the rotor always maintains a constant clockwise angular velocity v = 6 rad> s, determine the initial angular acceleration of the cylinder. the coefficient of kinetic friction at the contacting surfaces b and c is mk = 0.2.

Will mark as brainliest how does a catapult increase the trajectory of an object? ps. answer as if u were a 5th grader

What is the relationship between globular clusters and the milky way?