WAEC - Physics (2004 - No. 15)
A body of mass 8kg moving with a speed of 30ms-1 is brought to rest in 2.5s by a constant retarding force. Calculate the magnitude of the force
240N
96N
20N
9N
คำอธิบาย
F = ma = \(\frac{mv}{t} = \frac{8 \times 30}{2.5} = 96\)