Agolf ball of mass 50g travels at 70 m/s hits a persons head ( stopping in 0.05 second ), what is the impact force

What is the kinetic energy of a 10-kg bicycle moving at 10 m/s

True or false: the revolution of the earth creates day and night as it rotates around the sun

Two manned satellites approaching one another at a relative speed of 0.550 m/s intend to dock. the first has a mass of 2.50 ✕ 103 kg, and the second a mass of 7.50 ✕ 103 kg. assume that the positive direction is directed from the second satellite towards the first satellite. (a) calculate the final velocity after docking, in the frame of reference in which the first satellite was originally at rest.(b) what is the loss of kinetic energy in this inelastic collision? (c) repeat both parts, in the frame of reference in which the second satellite was originally at rest. final velocity(d) loss of kinetic energy = ?