class 9 force and law of motion
1.A truck starts from rest and rolls down a hill with a constant acceleration. It travels a distance of 400m in 20s.Find it's acceleration. Find the force acting on it if it's mass is 7 tonnes.
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initial velocity = 0
distance travelled = 400m
time taken = 20s
we know, s = ut +1/2 at square
400 = 0+ 1/2 a 20 square
a = 2ms raise to -2
m = 7 metric tonne = 7000kg, a = ms raise to -2
f= ma = 7000× 2 = 14000n
distance travelled = 400m
time taken = 20s
we know, s = ut +1/2 at square
400 = 0+ 1/2 a 20 square
a = 2ms raise to -2
m = 7 metric tonne = 7000kg, a = ms raise to -2
f= ma = 7000× 2 = 14000n
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