A person runs around a semi-circle of radius 10m. a) What is the person's
distance? b) What is the person's
displacement?

Which instrument is used to measure air temperature

Which sound characteristic is not affected by the relative motion of an object

Under the action of a constant force an object accelerates at 7.8 m/s2. what will the acceleration be if (a) the force is halved? (b) the object's mass is halved? (c) the force and the object's mass are both halved? (d) the force is halved and the object's mass is doubled?