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
A
240.0N
B
800.0N
C
1600.00N
D
2400.0N
Verified Correct Answer: A.
Physical Principles & Numerical Solution
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 \(\frac{3}{10} = 240N\)
Source: Myschool Past Questions Archive (Record #34861)