Question

A truck starts from rest and covers a distance of 400m in 20s. Find its acceleration.also find the force acting on it if it's mass is 7000kg

Answer 1

Explanation:

in 20 s , 400m

so the truck covers 400m/20s = 20m per second

in an hour 3600seconds

3600 × 20 = 72000m = 72km per hour

force = mass × acceleration

f = 7000×72 = 504000

Answer 2

u=0

s=400m

t=20s

s=ut+1/2at2

400=(0)+1/2(a)(20)2

400X2=a400

800=400a

2m/s2=a

F=ma

F=7000*2

F=14000N