A2000-kg car traveling at 40m/s hits a wall with a force of 40,000n and comes to a stop what was the impact time? a-0.5s b-2s c-400s d-800s

Option (B)

Explanation:

mass of car, m = 2000 kg, initial velocity of car, u = 40 m/s,

Force, F = 40,000 N, Final velocity, v = 0 m/s

Let the impact time be t.

By use of Newton's second law

F = m a

where, a be the acceleration and m be the mass.

40000 = 2000 x a

a = 20 m/s^2

Acceleration is negative because the car is stopped.

Use first equation of motion,

v = u + a x t

0 = 40 - 20 x t

t = 2 second

. west

the order for strong to weak forces such as

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force

the fundamental forces are those forces that act between to objects or element to make interactions. there are four types of fundamental forces such as strong and weak nuclear forces (due to protons and electrons), electromagnetic force (due to the motion of electrons) and gravitational force (due to orbital movement of the planet). if these forces are arranged on the basis of their maximum strength then the order is

strong nuclear force → electromegnetic force → weak nuclear force → gravitational force