Posted by rocal on Saturday, May 19, 2012 at 4:00am.
1 a cyclist moving on a circular track of radius 100m completes one revolution in 2 minutes what is his average speed and average velocity in one full revolution.
2 moving with uniform acceleration a body covers150m during 10 sec so that it covers 24m during the 10th sec wat is the initial velocity and acceleration of the bdy

physics  Elena, Saturday, May 19, 2012 at 6:39pm
1. Average speed = total distance travelled/ total time taken = 2•π•100/2•60 = 5.24 m/s,
Displacement is the distance from starting point to the end point.
Average velocity = final displacement/total time taken = 0/t =0.
2.
s =vₒ•t +a•t²/2,
v(9) = vₒ +a•9,
24 =v(9) •1 + a•1²/2 =
=vₒ +a•9 + a•1²/2 =
= vₒ +9.5•a.
s =vₒ•t +a•t²/2 =>
150 = vₒ•10+ a•100/2 =
= 10• vₒ + 50•a.
24= vₒ +9.5•a,
150= 10• vₒ + 50•a.
45° = 90,
a = 2 m/s².
vₒ = 249.5 •a = 5 m/s.

physics  reema, Tuesday, June 4, 2013 at 5:05am
average speed = total distance /total time
radius=50m so circumference=2*22/7*50
= 311.43/4
=7.85
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