Question

a 2000 kg car traveling to the right at 30 m/s collides with a brick wall and com to rest in 0.20 s what is average force the car exens on the wall?

Answer 1

Answer:

MEarth=5.97 x 1024 kg

REarth=6378 km = 6.378 x 106 m

vescape= (2 x 6.67 x 10-11 N-m2/kg3 x 5.97 x 1024 kg / 6.378 x 106 m)0.5

vescape=1.12 x 104m/sec=11.2 km/sec

(this is equivalent to about 7 miles/sec or 25,200 miles per hour)