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While playing with her 5 year old cousin, a Physics 135 student pushed him forward on his scooter. She pushes with a force of 50 Newtons for 3.5 seconds.
If the boy and the scooter together have a mass of 30 kg, what is their final velocity?

a.2.06 m/s
b.12.54 m/s
c.5.83 m/s
d.0.99 m/s

Respuesta :

pmdislamabad

Answer:

5.83 m/sec

Explanation:

We know that;

F=ma

also we know

a=V/t

put value of a in above equation;

==> F=mV/t

==> V=F×t/m= 50×3.5/30=5.833 m/sec

Answer:

10.2 m/s^2.

Explanation:

Momentum = Force x time

F x t = m*vf - m*vi

Initially at rest, vi = 0 m/s

v = F*t/m

= 50 * 3.5/30

= 5.83 m/s

acceleration = velocity/time

= 5.83/3.5

= 1.67 m/s^2

Using,

S = vi*t + 1/2 at^2

S = 1/2 * 1.67 * 3.5 * 3.5

= 10.21 m

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