Question

The length of the base of a right angle triangle is 2x units and its area is 4x square + 4. Find the length of the perpendicular of the triangle. ​

Answer 1

Step-by-step explanation:

There are three different speeds with different times

30 km/h for ½ hr

25 km/h for 1 hr

40 km/h for 2hr

⇢

Speed

avg

=

Time

Distance

⇢Speed=

1+2+

2

1

(30×

2

1

)+(25×1)+(40×2)

⇢Speed=

1+2+0.5

15+25+40

⇢Speed=

3.5

15+25+40

⇢Speed=

3.5

80

⇢Speed=22.85

Average speed is 22.9 m/s

Derivation of v = u + at

BD = BC - CD

⇒ BD = v - u -----(1)

And, we know that :

Acceleration = Change in velocity/Time

⇒a = BD/AC

⇒a = BD/t

⇒at = BD

Put value of BD form 1

⇒at = v - u

Hence Proved