Question

. A train moving with uniform speed covers a
distance of 120 m in 2 s. Calculate : (i) the speed
of the train, (ii) the time it will take to cover
240 m.​

Answer 1

Given :

distance covered by the train, d = 120m

time taken, t = 2s.

To find :

(i) the speed of the train

(ii) the time it will take to cover 240 m.

Solution :

(i) we know that,

The distance travelled by a body per unit time is called speed.

Speed is scalar quantity.

${ \leadsto{ \bf{Speed = \dfrac{distance}{time}}}}$

${ \leadsto{ \bf{Speed = \dfrac{120 \: m}{2 \: s}}}}$

${ \leadsto{ \bf{Speed = 4 \: m/s}}}$

thus, speed of the train is 4m/s.

(ii) the time it will take to cover 240 m is

${ \leadsto{ \bf{time = \dfrac{distance}{speed}}}}$

${ \leadsto{ \bf{time = \dfrac{240}{60}}}}$

${ \leadsto{ \bf{time = 4 \: sec}}}$

thus,the time it will take to cover 240 m is 4sec.

Remember !

SI unit of speed is meter per second (m/s).