Question

8. A student lifts a 10.0 pound ball 7.00 feet in 7.00 seconds.

Answer 1

Answer:

(a) W = 70 lb-ft   (b) 94.85 J

Explanation:

Given that,

A student lifts a 10.0 pound ball 7.00 feet in 7.00 seconds.

(a) We need to find the work done.

Work done = Force × displacement

i.e.

W = 10 × 7

W = 70 lb-ft

(b) We know that,

1 lb-foot = 1.355 J

50 lb-ft = (70 × 1.355) J

= 94.85 J

Hence, this is the required solution.