Question

Please answer the 23rd question

Answer 1

Please refer to the attachment for the solution.....

Hope that helps.....

Answer 2

a=-5 m/s^2

p= -24000 kgm/s.

m= -6000 N.

Given,

mass=1200 kg

v=18 km/h , 18×5/18 = 5 m/s

u=90 km/h , 90×5/18= 25 m/s

t=4s

a=v-u

___

t

a= 5-25

_____

4

a=-20/4

a= -5 m/s^2.

p= m(v-u)

=1200(5-25)

=1200(-20)

= -24000 kgm/s.

m=p/t

= -24000/4

= -6000N.

As the force exerted by the object is decreasing and the displacement of an object is opposite in direction, the answers are negative....