QUESTION ONE 1
An aeroplane of mass 2.5 - 10 kg lands with a speed of 62 m/s, on a horizontal runway at time
10. The aeroplane decelerates uniformly as it travels along the runway in a straight line until it
reaches a speed of 6.0 m/s at t = 355,
(a) Calculate:
(1) the deceleration of the aeroplane in the 35 s after it lands

The deceleration of the aeroplane is 1.6 m/s²

Explanation:

The speed of the aero plane after landing = 62 m/s

The time of deceleration of the aero plane = 35 seconds

The speed of the aero plane after deceleration for 35 s = 6.0 m/s

Therefore, we have the kinematic equation of motion of the aero plane, v = u - a·t

Where;

v = The final velocity = 6 m/s

a = The deceleration of the aero plane

t = The time of deceleration = 35 s

u = The initial velocity = 62 m/s

Substituting the values gives;

6 = 62 - a × 35

35·a = 62 - 6 = 56

a = 56/35 = 1.6

The deceleration of the aero plane = a = 1.6 m/s²

this is an example of "committed" time.

committed time, as contracted time, takes need over essential and available time since it is seen as profitable work. it alludes to the time allotted to keep up a home and family. at the point when a man is commuting using committed time this individual may feel that the drive is an obligation to family, for example, strolling youngsters to class or driving a mate to work. contracted and committed time clients may feel that their commute could really compare to the commute of important or leisure time clients on the grounds that their commute is profitable work. in this manner, they might be more disposed to pick a mechanized method of movement.  

float.

archimedes' principle

denser than water sinks in water.

denser than mercury would sink in it