Question

Find the initial velocity of a car which stopped in 10 seconds by applying brakes. The retardation due to brake is 2.5m/s2

Answer 1

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Here's Your Answer

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v = 0

a = 2.5 m/s2

t = 10 sec

u = ?

according to first equation of motion,

v = u + at

0 = u + 2.5×10

0 = u + 25

u = -25

initial velocity of car is -25 m/s....

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Answer 2

Here is your answer

here,
v= 0m/s

t= 10 secs

a= -2.5m/s^2 (since retardation is negative acceleration)

by equation of motion
v = u + at
0 = u + (-2.5 × 10)
0 = u - 25 m/s
u = 25 m/s
So, initial velocity of car is 25 m/s