1.
Important formula for conversion from one unit to another unit
km/hr
to m/s conversion:
|
a km/hr =
|
 |
a x
|
5
|
 |
m/s.
|
|
18
|
2.
m/s
to km/hr conversion:
|
a m/s =
|
|
a x
|
18
|
|
km/hr.
|
|
5
|
4.
Time taken by a train of
length l meters to pass a pole or standing man or a signal
post is equal to the time taken by the train to cover l meters.
5.
Time taken by a train of
length l meters to pass a stationery object of length b meters is the time taken by the train to cover (l + b) meters.
6.
Suppose two trains or
two objects bodies are moving in the same direction at u m/s
and v m/s, where u > v, then
their relative speed is = (u - v) m/s.
7.
Suppose two trains or
two objects bodies are moving in opposite directions at u m/s
and v m/s, then their relative speed is = (u + v)
m/s.
8.
If two trains of
length a meters and b meters are moving in
opposite directions at u m/s and v m/s, then:
|
The
time taken by the trains to cross each other =
|
(a + b)
|
sec.
|
|
(u + v)
|
9.
If two trains of length a meters and b meters are moving in the same direction at u m/s
and v m/s, then:
|
The
time taken by the faster train to cross the slower train =
|
(a + b)
|
sec.
|
|
(u - v)
|
10.
If two trains (or
bodies) start at the same time from points A and B towards each other and after
crossing they take a and b sec in reaching B
and A respectively, then:
(A's speed) : (B's
speed) = (b : a)
No comments:
Post a Comment