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...R an object is projected vertically upwards at time t air resistance negligible the passes same point above its starting position times s and if g m what initial speed of a b c d markscheme uniform ladder resting in equilibrium on rough ground leans against smooth wall which diagram correctly shows forces acting falls from rest height h close to surface moon has no atmosphere when fallen kinetic energy gravitational potential child x throws ball y system consists children earth true for been caught by momentum equal opposite rotation will have changed net while it total not increasing force acts metal wire extends length l new graph variation with required extend e then contracts half original extension work done as distances between successive positions moving car measured intervals are shown moves acceleration that increases linearly non constant straight line f resistive act along both rate change during motor input power w raises mass kg efficiency box accelerated right across hori...