Question

A football is thrown with an acceleration of 15 $\frac{m}{s^2}$and a force of 13 N. What is its mass?
150 kg
0.12 kg
0.87 kg
2.0 x 105 kg

Answer 1

Solution:

• F = v d/dt (m) + m d/dt (v)

Here, mass is constant.

Therefore, F = m d/dt (v)

i.e. F = m a

» 13 = m × 15

» m = 0.87 kg (approx)