Question

An automobile weighing 9kn travels at 80 km/hr at the foot of an incline 10% motor is turned off. How far does the car travel up the incline

Answer 1

▁ ▂ ▄ ▅ ▆ ▇ █ ʜᴇʀᴇ ɪs ʏᴏᴜʀ ᴀɴsᴡᴇʀ █ ▇ ▆ ▅ ▄ ▂ ▁

▶Conversion 72*5/18 is 20m/s  

now here the whole kinetic energy will be converted into potential energy when the automobile stops thus

1/2mv^2=mgh

20*20/2=9.8*h

200/9.8=h

20.4=h

so the body will go 20.4 meters high vertically but now here the inclined angle given is 30° now vertical creates 90° hence 90-30 gives 60° thus cos60° will be multiplied now we get 20.4*1/2

thus approximately 10 meters  ✔✔✔

ʙᴇ ʏᴏᴜʀs.....^_^