Question

14. An object starts from rest and is uniformly accelerated so that its speed is 60 m/s after 20s. If it travels with this speed for 40 s and is then brought to rest by a uniform retardation in 30 s.​

Answer 1

Answer:

sorry

Explanation:

Can u say what should we find,the acceleration or speed or velocity?

Answer 2

Correct option is

C

90 m

s=u×t+

2

1

×a×t

2

-------(1)

a=

t

v−u

-------(2)

where s is Distance travelled.

u is initial Speed.

v is final Speed.

a is Acceleration.

t is time.

Given : u=0,v=30

s

m

,t=6sec

a=

6

30

using equ. (2)

a=5

s

2

m

s=0+

2

1

×5×6

2

using equ. (1)

s=90m