Energy 2 Grade 7

A footbal of mass 0.5 Kg was kicked up to a height of h, and it hit the ground with a speed 21 m/s. find height (If g = 10 m/s² and h = v²/2g)

• 22,05 m

• 30.5 m
• 44.1 m
• 15.8 m

a spiring is compressed and a 3 kg block is placed against the spring. if the block slides at a maximum speed of 24 m/s after the spiring is released from a compression of 4 m from its original position, what is the spring constant in unit N/m (If K = m.v²/x²)

• 108.0
• 75.0
• 200.0
• 50.0

What is kinetic energy of a 2 kg object that is moving what a speed of 20 m/s?

• 400 J
• 200 J
• 800 J
• 100 J

An object moving with a speed of 5 m/s and has a kinetic energy 200 J, what is the mass of the object

• 10 kg
• 50 kg
• 25 kg
• 16 kg

An object has a kinetic energy of 160J and mass of 0,8 Kg, how fast is the object moving?

• 20 m/s
• 15 m/s
• 30 m/s
• 10 m/s

A 100 N/m spring is compressed with 4 Kg block. If the block slides at maximum speed of 0,4 m/s after the spring is released, how much was the spring compressed from its original position?

• 0,8 m

• 0,08 m

• 0,6 m

• 0,06 m

A ball is thrown 20 m above the ground. what is the speed of the ball when it hits the ground? (If g = 10 m/s²)

• 10 m/s
• 15 m/s

• 20 m/s

• 25 m/s

Determine the kinetic energy of 20 Kg man running at 15 m/s.

• 3000 Joules
• 1800 Joules
• 1500 Joules
• 2250 Joules

What is kinetic energy of a 12 Kg object that is moving with a speed of 4 m/s?

• 72 Joules
• 120 Joules
• 96 Joules
• 48 Joules

An object has a kinetic energy of 18 J and a mass of 0.01Kg. how fast is the object moving?

• 80

• 60

• 40

• 20