Question

a truck starts from rest and Rolls down a Hill with a constant acceleration it travels a distance of 400 m in 20 seconds find its acceleration find the force acting on it if its mass is 7000kg

Answer 1

The truck starts from rest, so initial velocity = 0

Distance travelled = 400 m

Time taken = 20 s

We know the equation of motion, S = ut + ½ at2

400 = 0 + ½ a * (20)2

a = 2 m/s2

Now, mass = 7 metric tonnes

= 7 * 1000

= 7000 kg

So force = mass * acceleration

F = 7000 * 2

= 14000 N

Answer 2

Given,
u = 0
s= 400 m
t= 20 sec
As we know that,
s = ut+(1/2)at²
By implying values, we get
⇒400 = (1/2) a×(20)²
⇒800 = 400 a
⇒a = 2 m/s²
F = ma = 7000×2 = 14000 N