Please do it fast tomorrow is my exam.

1.	Please do it fast tomorrow is my exam.
Answer» Answer :- Speed of train , u = 90 km/h = 90 × 5/18 = 25 m/s acceleration , a = -0.5 m/s² Use FORMULA, v = u + at Finally train will be rest so, final velocity, v = 0 0 = 25 - 0.5t 25 = 0.5t ⇒t = 50 sec Again, use formula, S = UT + 1/2at² Where S is distance TRAVELLED before stop S = 25 × 50 - 1/2 × 0.5 × 50² = 1250 - 1/2 × 0.5 × 2500 = 1250 - 625 = 625 m Hence, distance travelled = 625m and time taken = 50 sec

Answer»

Answer :-

Speed of train , u = 90 km/h = 90 × 5/18 = 25 m/s

acceleration , a = -0.5 m/s²

Use FORMULA,

v = u + at

Finally train will be rest so, final velocity, v = 0

0 = 25 - 0.5t

25 = 0.5t ⇒t = 50 sec

Again, use formula,

S = UT + 1/2at²

Where S is distance TRAVELLED before stop

S = 25 × 50 - 1/2 × 0.5 × 50²

= 1250 - 1/2 × 0.5 × 2500

= 1250 - 625

= 625 m

Hence, distance travelled = 625m and time taken = 50 sec

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