Ayisha216
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A body starting from rest and moves with uniform acceleration. The velocities of the body are 40 m/s at the 4th second and 60 m/s at 8th second.
a) Calculate the acceleration of the body?
b) What will be its velocity after two seconds?

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Respuesta :

SiliconFinisher1

Answer:

acceleration=change in velocity/time

a=(60-40)/(8-4)

a=20/4

a=5m/s²

b) V=u+at

V=60+5(2)

V=60+10

V=70m/s

Explanation:

The object started from rest and changes it's velocity from 0 to 40 to 60. From time of 0 to 4 to 8

V= final velocity

U= initial velocity

Since the object moves with uniform acceleration, one can choose 0m/s and 40m/s as initial and final velocity respectively.

b) we can make 60m/s the initial velocity . From the first equation of motion

V=u+at

Where V is the final velocity after the 2 seconds

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