Question

pl answer this! it's very very urgent!!!!

Answer 1

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1) (i) A body is said to be in uniform acceleration if it travels in a straight line and its velocity increases or decreases by equal amounts in equal intervals of time.

(ii) A body said to be in non uniform acceleration if the rate of change of its velocity is not constant.

2) we have,
u = 80 km/hr
v = 60 km/hr
t = 5 sec
now,
acceleration (a) =?

we know that:

v= u+at

60 = 80+a × 5 sec

60 - 80 = 5a

-20 = 5a

$a = \frac{ - 20}{5}$

a = -4 km/h/s

therefore, acceleration= -4km/h/s or -1.1m/s^2.

3)

we have,

initial velocity (u) =0

final velocity (v) = 40km/h = 11.11m/s^2

time(t) = 10 mins = 60×10 =600 secs.

acceleration (a) = ?

we know that,

v = u + at

40km/h= 0km/h+a× 10mins

11.11m/s = a × 600 secs

$a = \frac{11.11}{600} = 0.0185$


therefore, acceleration= 0.0185m/s^2.



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Answer 2

Answer:

2) u= 80km/hr

80×5

10.

= 200

9

v=60km /hr

60×5

18

150

9

t=5sec

so,

v=u+at

150 = 200 +a×5

9. 9

150 200 =5a

9. 9.

50 = 5a

9

10 m/s =a

9