Question

4. The velocity of a body moving with velocity of 20m * s ^ - 1 and having an acceleration of 4m * s ^ - 2 after 2 s will be(a) 24 m^ prime s^ -1 (c) 32m * s ^ - 1 (b) 28m * s ^ - 1 (d) 40m * s ^ - 1.​

Answer 1

""" ❤️ Answer ❤️ """

According to question

at

t=

2s

,

v=

30m/s

at

t=

4s

,

v=

60m/s

So,

acceleration =

d t

d v

=

4−2

60−30

=

15m/s

2

a= 15m/s

2

from

1 st

equation of motin is first case

v= u+ at

u=

0m/s

30= u+ 15(2)

Hence (A) option is correct answer