Question

A body starting from rest and travelling with
uniform acceleration has a velocity of 40 m/s after
10 second at A. Velocity of the body 4 second
before it crosses the point 'A' is
1) 16 m/s
2) 20 m/s
3) 24 m/s
4) 32 m/s​

Answer 1

Answer: 16m/s

Explanation:

given,

final velocity,v=40 m/s

initial velocity,u=0 m/s

acceleration, a = ?

final velocity after 4 second ,v= ?

                        a =(final velocity-initial velocity)/time taken

                           =(40-0)/10

                           =40/10

                           =4 m/s square

Now, a=4 m/s square (uniform acceleration)

a = (v-u)/t

or, 4=(v-0)/4

or, 4*4=v

therefore, v=16 m/s