Q 5.     A truck starts from rest and rolls down a hill with a constant acceleration. It travels a distance of 400 m in 20 s. Find its acceleration. Find the force acting on it if its mass is 7 tonnes (Hint: 1 tonne = 1000 kg.)

Answers (1)

From the equations of motion we can write :

                                                           s\ =\ ut\ +\ \frac{1}{2}at^2

or                                                   400\ =\ 0\times 20\ +\ \frac{1}{2}\times a\times 20^2

or                                                        a\ =\ \frac{400}{200}\ =\ 2\ m/s^2

And the force acting on the truck is given by :

                                                        F\ =\ ma

                                                               =\ 7000\times 2

                                                        F\ =\ 14000\ N         

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