Question

Q12. A car moving one dimensionally
20 m/s is stopped using applying brakes which provides a constant
retardation of 5 m/s2. The displacement covered by it in 5th second is
(1) Zero
(P) 2.5 m
(3) 42.5 m
(4) 22.5 m​

Answer 1

Answer:

42.5 m

Explanation:

Given :

u = 20 m/s

a = 5 m/s^2

Now,

Sn^th = u + 1 a (2n-1)

----

2

= 20 + 1 × 5 (2×5-1)

-------

2

= 20 + 5 × 9

--------

2

= 20 + 22.5

= 42.5 m