A car of mass 300kg starts from rest and travels upwards along a straight road of 450m inclined at an angle of to the horizontal and the speed of the car is at the top of the slope. Determine: its acceleration, the time taken to travel the length of the slope, gain in kinetic energy and gain in gravitational potential energy. (b) The position of a particle is given (i) what is its instantaneous velocity and acceleration at ? (ii) at what time is the particle at rest.