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1. v ^2= u ^2+2as so 3^2=0^2+2a15 equal to 0.3 the question is how the answer can be -0.30m/ s ^2 while i get positive?

... equate: change in kinetic energy of system = net work done on system 1/2 m ( v ^2 - u ^2) = m a s multiply both sides with 2 and divide with m : v ^2 - u ^2 = 2 a s add u ^2...

1 Answers · Science & Mathematics · 06/11/2013

2. How long would the ball need to stop if you threw it upwards with u =10m/ s on the moon?

t = v /g = 10 m/ s / 1.62 m/s² = 6.17 seconds I'm assuming by "stop" you mean come to a momentary stop at the top of it' s trajectory. If you mean "stop" when it hits the ground...

1 Answers · Science & Mathematics · 15/02/2012

3. A baseball is hit straight up with a speed of 15 m. Ignore air resistance. s (a) How long does it take the bal?

u = 15 m/ s (a) How long does it take the ball to reach the highest point of the...at ground level. T (up) = ? T (down) = ? v = u + gt 0 = 15 + (-9.8)t .................... At highest point...

1 Answers · Science & Mathematics · 09/02/2013

4. physic mechanic question..?

...20cm/ s s = 40cm t = ? a = ? Part (i) wants t. So we use s = ( u + v )/2 * t, which rearranges to give: t = 2s/( u + v ) t = 80/(30 + 20) = 1.6s...

3 Answers · Science & Mathematics · 02/04/2012

5. A baseball is hit straight up at an initial velocity of 100 m/ s . How long will it take to hit the ground?

given terms u = 100m/ s v =0 g=9.8m/ s t=? formula is v = u -gt so t=( v - u )/-g =(0-100)/-9.8...

5 Answers · Science & Mathematics · 17/09/2010

6. An Olympic long jumper is capable of jumping 8.0 m. Assuming his horizontal speed is 9.1 m/ s as he leaves the?

u -initial velocity s -displacement v -final velocity t-time taken Given s =8, u =9.1, v =0 s =0.5( v + u )t t=2s/( v + u ) =2*8/(0+9.1) =1.76s t in the air=1.76/2 =0.88s

2 Answers · Science & Mathematics · 02/11/2007

7. physics help!!!!!! A 1.90-F capacitor is connected to a 12.0- V battery for a long time, and then is disconnect?

After a " long time", V _C = 12V. Energy stored in capacitor. U = ½ Q² / ...capacitor: 1 W = 1 J/ s Energy used = 1...

1 Answers · Science & Mathematics · 15/09/2013

8. A long jumper leaves the ground at an angle of 15.2 ◦ to the horizontal and at a speed of 9.21 m/ s ?

...: ( v ↑)² = ( u ↑)² + 2as s = (( v ↑)² - ( u ↑)²) / 2a s = (0² - 2.41²) / (2 x -9.8) = -5.81 / -19.6 s = 0.296 m Range of long jumper (distance jumped): R = (← v ) t...

2 Answers · Science & Mathematics · 28/10/2012

9. I will put up the Kinematic equations: 1.)a=vf-vi/t 2) v =d/t 3)2ad=vf^2-vi^2 4)d=1/2(vi+vf)t 5)d=vit+1/2at^2.?

Up u =2.8 m/ s v =0m/ s a=-9.8m/ s / s t=? s =? s =( v ^2 - u ^2) / 2a s = (0 - 7.84) / -19.6 = 0.4m Down u =0m...the way if you were wondering u =initial velocity v =final velocity a=acceleration t=time s =displacement

3 Answers · Science & Mathematics · 11/10/2008

10. A runner of mass 64.5 kg initially moves at a speed of 8.35 m/ s . How long must an average external force of 2.40*102 N act to bring?

... = I mΔ v ̂/Δt I = 64.5( v - u )/ Δt u = 8.35 m/ s v = 0 m/ s Δt = ? IF̂ₐᵥₑI = -240 N = 64.5( v - u ...

2 Answers · Science & Mathematics · 16/10/2014

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