Question

The speed of planet is greater when it is closer to the sun than when it is farther away from the sun. Explain

Answer 1

due to the centrepetal force

Answer 2

A planet's orbital speed changes, depending on how far it is from the Sun. The closer a planet is to the Sun, the stronger the Sun's gravitational pull on it, and the faster the planet moves. The farther it is from the Sun, the weaker the Sun's gravitational pull, and the slower it moves in its orbit.