Answer:
S = 0.9 km
Step-by-step explanation:
Given:
Initial Velocity = [tex]V_{i}[/tex] = 50 km/hr = 13.89 m/s
Final Velocity = [tex]V_{f}[/tex] = 10 km/hr = 2.78 m/s
Time = t = 2 mins = 120 secs
Required:
Distance = S = ?
Solution:
Using 1st equation of motion:
=> [tex]V_{f} = V_{i} + at[/tex]
=> 2.78 = 13.89 + (a)(120)
=> 120a = 2.78 - 13.89
=> 120a = -11.11
Dividing both sides by 120
=> a = -0.1 m/s²
Now, Finding S by 2nd equation of motion:
S = [tex]V_{i}t+\frac{1}{2} at^2[/tex]
S = (13.89)(120)+1/2(-0.1)(120)^2
S = 1666.8 - 720
S = 946.8 metres
In kilometers
S = 0.9 km
