What is meant by a stationary object??​

Yardım edin lütfen uzun cevap lazım çok puan veriyorum

Which of these statements is true? a. quarks pair with leptons to form protons and neutrons. b. quarks pair with bosons to form photons. c. quarks pair with photons to form protons and neutrons. d. quarks pair with other quarks to form protons and neutrons. e. quarks pair with electrons to form protons.

What is the average speed of a car that travels 40 mph for 1 hour and 60 mph in another hour?