Question

A truck starts from rest and rolls down a hill with a constant acceleration. It travels a distance of
400m in 20s. Find its acceleration.

Answer 1

Answer:

Given data:

Mass of stone(m)=7000 kg

Distance(S)=400 meter

Time(t)=20 second

1) We have to find the acceleration of the truck

So from the equation of motion S=ut+

2

1

a×t

2

, whereu=0

S=

2

1

a×t

2

a=

t

2

2×S

=

20×20

2×400

=2

sec

2

m

2) Force acting on truck

So,from newton's 2

nd

law of motion

F

=ma=7000×2=14000N=14kN

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Answer 2

Let the initial velocity (u) be 0 m/s since train starts from rest, distance travelled (s) be 400 m and time taken (t) to travel s be 20 s. Let the acceleration be a m/s^2.

We have the formula s = ut + (1/2) at^2

On solving it.. We get

a = 2 m/s^2

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