Need the force, Fds, pointed down the hill. That's a component of the weight.
Fds = weight * sin(the angle between horizontal and slope)
Weight is m*g. Sine is opposite/hypotenuse, so the above sine function is 1/49. Do the math to find Fds (you don't know the mass, so just leave it as m). So you will get something like 0.nnn*m as the expression for Fds. Then use Newton's 2nd (F = m*a).
