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Could someone please help explain to me which formula should be used for a question like this...

A ball with the mass of 166.1 g is thrown vertically upwards with an initial velocity of 18.5 m/s. It is allowed to fall back to its original position. Ignoring air resistance, calculate the force acting on the ball during its upward movement.

Thank you

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Force acting on the ball=mg=1.661N for the entire upward and downward motion.

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  • $\begingroup$ Sorry, I am really new to physics. Could you please explain how you got to that answer? Thank you $\endgroup$
    – Millie
    Commented Aug 3, 2019 at 2:31
  • $\begingroup$ The only force(external) acting on the ball is the gravitation force, which is an attractive force acting towards the centre of the Earth here. The gravitation force is given by F=GmMe/r^2. Where Me is mass of the Earth and m is mass of body. r is distance of body from centre of Earth. For small heights above the Earth, r~R(radius of Earth). GMe/R^2 is a constant value, called acceleration due to gravity (g) value is ~ 9.8m/s^2. It may be taken as 10m/s^2 for ease of calculation. $\endgroup$
    – user600016
    Commented Aug 3, 2019 at 4:21
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Body will only experience a vertical downward force that is mg =1.661N

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