WAEC - Physics (2007 - No. 14)
A car of mass 800kg moves from rest on a horizontal track and travels 60m in 20s with uniform acceleration. Assuming there were no frictional forces, calculate the accelerating force
240.0N
800.0N
1600.00N
2400.0N
설명
S = at + \(\frac{1}{2} at^2\)
60 = 0 x 20 + \(\frac{1}{2}\) x a x 20\(^2\)
a = \(\frac{60}{200}\)
a = \(\frac{3}{10}\)m/s\(^2\)
F = ma = 800 x \(\frac{3}{10} = 240N\)