A projectile of mass 6 kg is fired with an(adsbygoogle = window.adsbygoogle || []).push({});

initial speed of 74 m/s at an angle of 20 degrees with

the horizontal. At the top of its trajectory,

the projectile explodes into two fragments of

masses 3.7 kg and 2.3 kg . The 2.3 kg fragment

lands on the ground directly below the point

of explosion 4.4 s after the explosion.

The acceleration of gravity is 9.81 m/s^2 .

A) Find the magnitude of the velocity of the

3.7 kg fragment immediatedly after the explo-

sion. Answer in units of m/s.

B) Find the distance between the point of firing

and the point at which the 3.7 kg fragment

strikes the ground. Answer in units of km.

C) How much energy was released in the explo-

sion? Answer in units of kJ.

Any help appreciated.

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# Projectile and conservation of motion

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