i've seen the answer is 0.25E from the book, so I just think should we squaring the cos60, ie (cos60)^2=0.25?
Doc Al: if the horizontal component of velocity remains unchange in a projectile motion, so the velocity is still v isn't it?
kinetic energy stuff...
here's the question...
an object is thrown upwards at a projection angle of 60 degree with kinetic energy E. When the object reaches max height, its kinetic energy becomes
A. (1/8)E
B. (1/4)E
C. (1/2)E
D. (3/2)E
I'm totally no idea...some1 kindly tells me the...
Max spped for a car to go around a curve track without skidding...confusing!
here's my question,
a car of mass 1000kg moves along the corner of a level road having a radius of curvature 35.0m. If the frictional force between the tyres and the road is 4kN, the maximum speed of the car without...