1. A car of mass  1200kg tows a caravan of mass 600kg. 

The resistive forces acting on the car and caravan are

proportional to their  individual weights  and  their  sum equals 900N.

The  vehicle  accelerates  at  2.0ms²on  a   flat road

(i) What  force  is  exerted  by  the  engine?

(ii) What is the tension in the tow bar?

(iii) What  is the power being  converted by the  engine after  5s?

2. An  object  of mass  m  slides  down

the  smooth  sloping

surface of a wedge of mass mz as shown in Fig.

The angle  of the  slope  in  θ=30°to

the  horizontal,the  wedge

sits on a  smooth horizontal  surface.