Question

Can anyone answer this?​

Answer 1

Explanation:

a) First we will convert 150km/hr to m/s.

`(150km)/(1hr) = ((150 * 1000)m)/((1 * 60)s) \\ = (150000m)/(60s) \\ = 2500m \: per \: second`

=2500m/s, which is the initial speed of the plane.

b)Final Speed of plane = Speed when it stopped.

= 0m/s.

c)Time taken to stop = 3 seconds.

d)Using the kinematic equation,

v = u + at,

where v = Final Speed = 0m/s

u = Initial Speed = 2500m/s

a = acceleration

t = time taken = 3 seconds

Substitute v, u and t to find a.

`0 = 2500 + 3a \\ 3a = - 2500 \\ a = - 2500 / 3 \\ = - 833 (1)/(3) \frac{m}{ {s}^(2) }`