speed of 2.5 ms, what force is needed to keep the conveyer belt moving?
at a rate of 50kgs. If the belt moves at a constant
be
7
A man standing in a lift holds a spring balance with a load of 5 kg suspended from it. What would
be the reading of the balance if the lift is (1) descending (i) ascending with an acceleration of

An 8000 kg rocket is set for a vertical firing. If the exhaust speed is 800m/s.how much gas must be ejected per second to supply thrust needed to overcome the weight of rocket
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