Question

9. A car moving at 36 km/h comes to rest in 10 seconds. It's acceleration will be
(a) - 10m/s?
(b) 10 m/s?.
(c)-1 m/s
(d) 1m/s2​

Answer 1

Answer:

36km/h

sec10

36/10

=10

Answer 2

Answer:

• Initial velocity u = 36 km/h = ( 36 ×1000/3600) = 10 m/s

• Final velocity v = 0 m/s

• Time in which the body is brought to rest = 10 s

Using the relation: v - u = a t, we have,

0 m/s - 10 m/s = a × 10 s

a = (-10 m/s)/10s = - 1 m/s²

So the (negative) acceleration a on the body

= - 1 m/s²

So, correct option is (c) -1 m/s^2