a truck is moving with a certain uniform velocity. it is accelerated uniformly by 0.75 m/s^2.after 20 seconds, the velocity becomes 72 km/h. find the initial velocity

Explanation:

Given:

Acceleration = a = 0.75 m/s²

Time = t = ?

Final Velocity = = 72 km/hr = 20 m/s

Required:

Initial Velocity = = ?

Formula:

a =

Solution:

For    the formula becomes:

 = 20 - (0.75)(20)

 = 20 - 15

 = 5 m/s

In Case: If you want it in km/hr:

 = 5 * 3.6

 = 18 km/hr

5 m/s

Explanation:

acceleration = 0.75 m/s²

time = 20 s

final velocity = 72 km/h = 20 m/s

initial velocity = ?

Apply formula for initial velocity.

Solve for u.

atomic = no of protons.

mass number-atomic number = neutron number

total distance travelled = 60 miles

total time taken =1.5 hours

average speed = total distance / total time

60 / 1.5

= 40

therefore, average speed = 40 m/h

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