please provide the answers step by step and do it on paper please and upload it.

1. Given =54 N, = 1.6 N, and = 1.2 m then, = ?

a. 28 N b. 41 N c. 72 N d. 1.6 x 10^2 N

2. Given =120 N, = 210 N, and = 1.2 m then, =

a. 1.2 m b. 0.48 m c. 1.5 m d. 2.1 m

3. 1.2 103-kg car has 1.2 105 J of kinetic energy. What is the car's speed expressed in km/h?

a. 51 b. 36 c. 16 d. 14