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Grade: 12

                        

A car is travelling on straight level road with a uniform speed of 60kmph it is followed by another car B which is moving with speed of 70kmph when the distance between them is 2.5km the car Back is given a deceleration of 20km/h2 after what distance of time B will catch up with A

2 years ago

Answers : (1)

Khimraj
3007 Points
							
s2 = ut + ½*a*t2 = 70t + ½*(-20)*t2 = 70t -10t2
s1 = 60t
s2 – s1 = 2.5
70t – 10t2 -60t = 2.5
10t2 -10t + 2.5 = 0
so t = ½ h
putting this in s2
s2 = 32.5km
Hope it clears.
 
2 years ago
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