can someone please answer my physics or help mw?

Question

A 75kg bobsled is pushed along a horizontal surface by two athletes. After the bobsled is pushes a distance of 4.5m starting from rest, its speed is 6.0m/s. Find the magnitudes of the net force on the bobsled.

Answer 1

First find the acceleration using v²=u²+2as
v=6
u=0
s=4.5
a=?

Then once you have found 'a' just use F=ma to find the nett force.

Answer 2

If the force is constant, the acceleration is constant. Under constant acceleration a, an object will reach a velocity a*t after t seconds. It also travels a distance = 0.5*a*t^2. Find t from the first: t = v/a, plug into the second to get

s = 0.5*v^2 / a, or a = 0.5*v^2 / s

You have s = 4.5m, and v = 6.0m/s, solve for a.

Then from the formula F = m*a, find F from the mass = 75 kg

Answer 3

No. Root propose sq. speed provides each and every of the squared speeds. THEN it sq. roots. Say you have 4 speeds: a million, 2, 3, 4. the essential is only their sum over 4: 10/4 = 2.5 however the RMS speed is this: sqrt ( a million + 4 + 9 + sixteen ) = sqrt (30) = 5.40 seven observe i did not evaluate something however the speeds themselves. by utilising squaring the speeds first, numbers that are slightly greater (4 is one extra advantageous than 3) get a lot greater (sixteen is fairly much double 9). the respond is c.