Question

answer me fast .....plsplspls​

Answer 1

Answer:

Here,

mass(m)= 1000 kg

initial velocity(u)=72km/h or20m/s

final velocity(v)= 0.....(comes to rest)

time taken = 4s

Now, a = v-u

t

a = 0 - 20

4

a= -20

4

a= -5 m/sq. s

Therefore, As F= ma

F= 1000 x -5

F= -5000 kg. m/sq. s

F= -5000N