Question

A 20 kg crate hangs at the end of a long rope. Find its acceleration when the tension in the rope is (a) 250 N (b) 150 N (c) zero (d) 196 N

Answer 1

The Newton's second law says

$$a=\frac{F}{m}$$

(a)

$$a=\frac{250}{20}=12.5\:\rm m/s^2$$

(b)

$$a=\frac{150}{20}=7.5\:\rm m/s^2$$

(c)

$$a=\frac{0}{20}=0\:\rm m/s^2$$

(d)

$$a=\frac{196}{20}=9.8\:\rm m/s^2$$