Question

20. If a bicycle goes speed from rest to 20km/hr in
2 hours what will be the acceleration ?
(a) 20km/h?
(b) 10km/h?
(c) 40km/h?
(d) 22km/h?​

Answer 1

Answer:

40km

Explanation:

when a bicycle goes 20km in 1 hours then it goes 40km in 2 hours .

= 1 hour - 20km

= 2 hour - 20km × 2hour

= 40 km

Answer 2

Given:

initial velocity (u) = 0

Final velocity (v) = 20 km/hr

Time taken (t) = 2 hr

To Find: Acceleration (a) of the bicycle

Calculation:

Acceleration is defined as rate of change in velocity with time.

$a=\frac{v-u}{t}$

$a=\frac{20-0}{2} =10km/hr^{2}$

The acceleration of bicycle is $10 km/hr^{2}$.

Answer:

Acceleration of bicycle is (b) $10 km/hr^{2}$.