Question

A train starting from a railway station attains
a speed of 40 km/hr in 10 min. Find its
acceleration.​

Answer 1

» A train starting from a railway station attains a speed of 40 km/hr in 10 min.

Here..

Speed = 40 km/hr

Time = 10 min

=> $\dfrac{10}{60}$

=> 0.167 hrs.

__________ [GIVEN]

• We have to find it's acceleration.

____________________________

We know that..

Acceleration = $\dfrac{Speed}{ Time}$

Put the known in above equation.

=> $\dfrac{40}{0.167}$

=> 239.52 km/hr²

____________ [ANSWER]

_______________________________

OR

✡ Speed = 40 km/hr

=> 40 × $\frac{5}{18}$

=> 11.11 m/s

Time = 10 min

=> 10 × 60

=> 600 sec

____________ [GIVEN]

• We have to find it's acceleration.

______________________________

We know that..

Acceleration = $\dfrac{Speed}{ Time}$

Put the known in above equation.

=> $\dfrac{11.11}{600}$

=> 0.0185 m/s²

__________ [ANSWER]

_______________________________

OR

v (final velocity) = 40 km/hr

=> 40 × $\frac{5}{18}$

=> 11.11 m/s

t (time) = 10 min

=> 10 × 60 = 600 sec

u (initial velocity) = 0 m/s

From first equation of motion

v = u + at

=> 11.11 = 0 + 600a

=> a = $\dfrac{11.11}{600}$

=> 0.0185 m/s²

__________ [ANSWER]

_______________________________