Question

a truck starts from rest and roles down a hill with a constant acceleration.it travels a distance of 400m in 20sec.find its acceleration.find the force acting on it if the mass is 7 metric tonnes​

Answer 1

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Answer 2

SOLUTION

The truck starts from rest so u= 0

s= ut +1/2at^2

s= 400m

t= 20sec.

Find acceleration?

=) s= ut+ 1/2at^2

=) 400= [0]20+ 1/2[a]× [20][20]

=)400= 0+ 1/2[400][a]

=) 400= 200[a]

=) a= 400/200

=) a= 2

f= ma

=) [1 tonne= 1000kg]

then, 7 tonne= 7×1000= 7000kg

=) m= 7000kg

a= 2

f= ma

=) 7000× 2

=) f= 14000N

hope it helps☺️⬆️