1. You throw a ball with a mass of 2kg. The ball leaves your hand at 32m/s. The ball has energy. Calculate it.
2. A woman with a mass of 64 kg climbs a set of stairs that are 3 meters high, How much gravitational potential energy does she gain as a result of the climb?
3. A 5 kg object fall from a cliff that is 9 meters long. Find its energy.
4. A 1200 kg car has a velocity of 18m/s. What is the car KE?
2. A woman with a mass of 64 kg climbs a set of stairs that are 3 meters high, How much gravitational potential energy does she gain as a result of the climb?
3. A 5 kg object fall from a cliff that is 9 meters long. Find its energy.
4. A 1200 kg car has a velocity of 18m/s. What is the car KE?
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Answer:
1. G - m = 2kg a = 32m/s
R - Fnet = ?
E - Fnet = m • a
S - Fnet = 2kg • 32m/s
A - Fnet = 64N
2. G - m = 64kg h = 3m
R - P.E.= ?
E - P.E. = mgh
S - P.E. = 64kg • 3m
A - P.E. = 192 J.
3. G - m = 5kg h = 9m
R - P.E. = ?
E - P.E. = mgh
S - P.E. = 5kg • 9m
A - P.E. = 45 J.
4. G - m = 1200kg v = 18m/s
R - KE = ?
E - KE = 1/2mv²
S - KE = 1/2 (1200kg) (18m/s)²
A - KE= 194,400 J.
Explanation:
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