Question

a train is moving at a speed of 144 km/h. when the driver applied breaks, it case to rest after 20 seconds. find out how far the train will go before it is brought to rest

Answer 1

Step-by-step explanation:

soln,

Given,

initial velocity(u)= 144km/hr = 144×1000÷60×60 = 40m/s

applied brake so, final velocity(v) = 0m/s

time taken(t)= 20sec

displacement(s) = ?

we have,

S= u+v÷2 × t

= 40-0 ÷2 × 20= 20×20= 400m