Question

F(t)=20t-10t^2+150

You have the above time dependent force acting on a 120 kg block, opposing its motion. The block was initially traveling at 10 m/s along a flat, frictionless surface, and the force acts for a length of time until the force first reaches zero.

How fast is the block traveling once the force has stopped?

		2 m/s
		3 m/s
		4 m/s
		5 m/s
		6 m/s
		7 m/s
		8 m/s

You have the above time dependent force acting on a 120 kg block, opposing its motion. The block was initially traveling at 10 m/s along a flat, frictionless surface, and the force acts for a length of time until the force first reaches zero.

How much Impulse does this force supply by the time it stops?

		30 kg m/s
		333 kg m/s
		767 kg m/s
		583 kg m/s
		85 kg m/s

You have the above time dependent force acting on a 120 kg block, opposing its motion. The block was initially traveling at 10 m/s along a flat, frictionless surface, and the force acts for a length of time until the force first reaches zero.

How long, in seconds, until the force stops acting on the block?

		8 s
		4 s
		7 s
		3 s
		5 s
		2 s
		6 s

A 5 kg ball is traveling to the right at a speed of 12 m/s.  A 2 kg ball is traveling to the left at 30 m/s.  They collide in a head-on perfectly elastic collision.  

What is the final speed of the 2 kg ball?

		0 m/s
		12 m/s
		17 m/s
		30 m/s
		42 m/s

A 5 kg ball is traveling to the right at a speed of 12 m/s.  A 2 kg ball is traveling to the left at 30 m/s.  They collide in a head-on perfectly elastic collision.  

What is the final speed of the 5 kg ball?

		0 m/s
		12 m/s
		17 m/s
		30 m/s
		42 m/s

A 5 kg ball is traveling to the right at a speed of 12 m/s.  A 2 kg ball is traveling to the right at 30 m/s as well.  They collide in a rear end inelastic collision.  

What is their final speed?

		0 m/s
		12 m/s
		17 m/s
		30 m/s
		42 m/s

Answer 1