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A truck starts from rest and rolls down a hill with a constant acceleration. It travels a distance of `400m` in `20 s`. Find its acceleration. Find the force acting on it if its mass is `7` metric tonnes (Hint.1 metric tonne=1000kg) |
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Answer» (a) Calculation of acceleration Here, Initial velocity, u=0 Distance travelled, s=400 m Time, t= 20 s And Acceleration, a =? (To be calculated) Now, `s=ut+1/2at^(2)` so, `400=0xx20+1/2xxaxx(20)^(2)` `400=0+1/2xxaxx400` `400=axx200` `a=400/200` `a=2m//s^(2)` Thus the acceleration of the truck is `2 m//s^(2)` (b) Calculation of force Force,F=m`xx`a F=`7xx1000xx2` F=14000N Thus, the force acting on the truck is of 14000 newtons. |
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