1 A crane is used to lift a crate, of mass 70 kg , vertically upwards. As the crate is lifted, it accelerates uniformly from rest, rising 8 metres in 5 seconds.
- Show that the acceleration of the crate is \(0.64 \mathrm {~m} \mathrm {~s} ^ { - 2 }\).
- The crate is attached to the crane by a single cable. Assume that there is no resistance to the motion of the crate.
Find the tension in the cable.
- Calculate the average speed of the crate during these 5 seconds.