*urgent*

1. what is the force of sliding friction between a block and the ground if the coefficient of kinetic friction is μk = 0.28 and the block weighs 17 n?

a. 81 n
b. 17 n
c. 4.8 n
d. 61 n
e. 1.3 n

2. a 300 kg spacecraft weighs 760 n on the surface of planet zphyz. what is the acceleration due to gravity on the planet’s surface?

a. 6.0 m/s^2
b. 2.5 m/s^2
c. 5.1 m/s^2
d. 0.0 m/s^2
e. 0.39 m/s^2

3. a 4900 kg jet reaches a takeoff velocity of 90 m/s after accelerating from rest for 800 m down the runway. what net force is required from the jet's engines?

a. 970 n
b. 44000 n
c. 3.5 x10^8 n
d. 25000 n
e. 5 n

4. the coefficient of kinetic friction between a floor and a box made of wood is μk = 0.13. how far does the box slide if it has an initial speed of vo = 5.0 m/s?

a. 29 m
b. 9.8 m
c. 39 m
d. 17 m
e. 11 m

5. what is the acceleration due to gravity on planet x if someone who weighs 900 n on earth weighs 2400 n on planet x?

a. 26 m/s^2
b. 3.7 m/s^2
c. 9.8 m/s^2
d. 92 m/s^2
e. 240 m/s^2

6. a 2.4 kg box is moving at 21 m/s on a frictionless plane. when will it stop?

a. 23
b. never s
c. 0.11 s
d. 8.8 s
e. immediately