4. Fig. shows apparatus that demonstrates how a coin and a piece of paper fall from rest under gravits piece of paper o coin tube containing air A Fig. 4 (a) State the initial value of the acceleration of the coin as it falls from rest. Initial velocity of the will be o when fa Coin (b) The coin and paper are at the positions shown in Fig. 4. Explain, in terms of the forces acting, why (i) the paper falls with constant speed,​