When you drop a 0.43 kg apple, earth exerts
a force on it that accelerates it at 9.8 m/s^2
toward the earth’s surface. according to newton’s third law, the apple must exert an equal
but opposite force on earth.
if the mass of the earth 5.98 × 1024 kg, what
is the magnitude of the earth’s acceleration
toward the apple?
answer in units of m/s^2

How are calculation for velocity and speed different

You are traveling in a car going at a constant speed of 100km/h down a long, straight highway. you pass another car going in the same direction which is traveling at a constant speed of 80km/h. as measured from your car's reference frame this other car is traveling at −20km/h. what is the acceleration of your car as measured from the other car's reference frame? what is the acceleration of the other car as measured from your car's reference frame?

Física: un futbolista patea hacia el arco con una velocidad de 15m/ah, calcular: a)el alcance para un ángulo de tiro de 25º, b) el tiempo que el balón permanece en el aire.