must PS 11 A firework of mass 0.3 kg has a charge that provides an upward force of 7 N for 3s. Assuming no air resistance, find the maximum height reached by the firework. a Lear b The explosive for the firework has a fuse that burns at a rate of 12 mm per second. Find how long the fuse imum height.
must PS 11 A firework of mass 0.3 kg has a charge that provides an upward force of 7 N for 3s. Assuming no air resistance, find the maximum height reached by the firework. a Lear b The explosive for the firework has a fuse that burns at a rate of 12 mm per second. Find how long the fuse imum height.
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Transcribed Image Text:10 A car of mass 350 kg is travelling at 30 ms when it starts to slow down, 100 m from
just using the air resistance of 200 N. Then, at a distance of sm from the junction, it slows using brakes,
providing a force of 2000 N as well as the air resistance. Find the distance from the junction at which the brakes
must be applied if the car is to stop at the junction.
PS 11 A firework of mass 0.3 kg has a charge that provides an upward force of 7 N for 3 s.
a
Assuming no air resistance, find the maximum height reached by the firework.
b
The explosive for the firework has a fuse that burns at a rate of 12 mm per second. Find how long the fuse
should be so the firework explodes at the maximum height.
12 A boy drags a cart of mass 5 kg with force 10 N along a horizontal road. There is air resistance of 2 N. At some
point the boy lets go of the cart and the cart slows down due to air resistance until coming to rest. In total, the
cart has travelled 36 m. Find the length of time the boy was dragging the cart. bosges
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