Ashell is fired at an angle of 35° above the horizontal at a velocity of 40 m/s. (a) what is it's speed at the highest point of the trajectory? (b) what is its time of flight?

Part a)

Part b)

T = 4.68 s

Explanation:

Part a)

Shell is fired at speed of 40 m/s at angle of 35 degree

so here we have

since gravity act opposite to vertical speed of the shell so at the highest point of its trajectory the vertical component of the speed will become zero

so at the highest point the speed is given

Part b)

After completing the motion we know that the displacement of the object will be zero in Y direction

so we have

b.a device that inputs heat into a cool object

the motion of a pendulum is a classic example of mechanical energy conservation. a pendulum consists of a mass (known as a bob ) attached by a string to a pivot point. as the pendulum moves it sweeps out a circular arc, moving back and forth in a periodic fashion.